Browse through 16,298 rectangular stack illustrations & vectors or explore more basil leaves or smooth surface vectors to complete your project with stunning visuals.

A precarious tower constructed from numerous rectangular wooden blocks stacked in an irregular and unbalanced manner, creating a sense of imminent collapse. Rectangular stack illustrations
A precarious tower constructed from numerous rectangular wooden blocks stacked in an irregular and unbalanced manner, creating a sense of imminent collapse. Rectangular stack illustrations
The six white folded cloth napkins arranged in two neat rows of three. Each napkin has a decorative, scalloped edge created by embroidery or a similar technique. The napkins are folded into a rectangular shape with visible folds and a smooth surface. The fabric appears to be linen or a similar natural textile, giving the napkins a slightly textured appearance. The napkins are stacked closely. Rectangular stack illustrations
The six white folded cloth napkins arranged in two neat rows of three. Each napkin has a decorative, scalloped edge created by embroidery or a similar technique. The napkins are folded into a rectangular shape with visible folds and a smooth surface. The fabric appears to be linen or a similar natural textile, giving the napkins a slightly textured appearance. The napkins are stacked closely. Rectangular stack illustrations
Rectangular Margherita pizza on a metal baking tray features a golden-brown crust and is topped with smooth tomato sauce, melted mozzarella cheese, and fresh basil leaves (Ocimum basilicum). The pizza rests on a wooden surface, providing a warm, rustic backdrop, and part of the kitchen environment is visible with a stack of white plates in the background. The combination of ingredients and the presentation highlights traditional Italian culinary elements. Rectangular stack illustrations
Rectangular Margherita pizza on a metal baking tray features a golden-brown crust and is topped with smooth tomato sauce, melted mozzarella cheese, and fresh basil leaves (Ocimum basilicum). The pizza rests on a wooden surface, providing a warm, rustic backdrop, and part of the kitchen environment is visible with a stack of white plates in the background. The combination of ingredients and the presentation highlights traditional Italian culinary elements. Rectangular stack illustrations
The image features a pair of sunglasses perched atop a stack of three books. the background is a vibrant gradient of blue and pink, with geometric shapes, specifically triangles and rectangular prisms, adding depth and visual interest. the sunglasses have a dark frame and blue lenses, creating a striking contrast against the colorful backdrop. the books are uniformly colored, blending seamlessly with the overall aesthetic. the composition is well-balanced, with the sunglasses serving as the focal point, drawing the viewer's eye to the center of the image. Rectangular stack illustrations
The image features a pair of sunglasses perched atop a stack of three books. the background is a vibrant gradient of blue and pink, with geometric shapes, specifically triangles and rectangular prisms, adding depth and visual interest. the sunglasses have a dark frame and blue lenses, creating a striking contrast against the colorful backdrop. the books are uniformly colored, blending seamlessly with the overall aesthetic. the composition is well-balanced, with the sunglasses serving as the focal point, drawing the viewer's eye to the center of the image. Rectangular stack illustrations
The image shows three rectangular bags of rice stacked on top of each other. The bags are made of a thin, transparent material and are filled with white rice. The bags are sealed and have a smooth texture. They are stacked in a neat and organized manner, with the top bag slightly overlapping the one below it. The background of the image is plain white, which helps to highlight the details of the. Rectangular stack illustrations
The image shows three rectangular bags of rice stacked on top of each other. The bags are made of a thin, transparent material and are filled with white rice. The bags are sealed and have a smooth texture. They are stacked in a neat and organized manner, with the top bag slightly overlapping the one below it. The background of the image is plain white, which helps to highlight the details of the. Rectangular stack illustrations
The image shows three sealed bags stacked on top of each other, filled with a light brown granular material. The bags are made of a thin material, likely plastic or burlap, and are placed on a plain white background. The bags are rectangular in shape and have a smooth surface. The overall appearance suggests that the contents are uniform and the bags are new or unused. Rectangular stack illustrations
The image shows three sealed bags stacked on top of each other, filled with a light brown granular material. The bags are made of a thin material, likely plastic or burlap, and are placed on a plain white background. The bags are rectangular in shape and have a smooth surface. The overall appearance suggests that the contents are uniform and the bags are new or unused. Rectangular stack illustrations
The image shows a yellow industrial forklift transporting a stack of empty wooden pallet shelves. The forklift is equipped with a mast and forks designed to lift and move heavy loads, specifically the palletized wooden shelves. The shelves appear to be made of light-colored wood, arranged neatly in a rectangular formation, and are secured on the forks for transport. Rectangular stack illustrations
The image shows a yellow industrial forklift transporting a stack of empty wooden pallet shelves. The forklift is equipped with a mast and forks designed to lift and move heavy loads, specifically the palletized wooden shelves. The shelves appear to be made of light-colored wood, arranged neatly in a rectangular formation, and are secured on the forks for transport. Rectangular stack illustrations
A studio shot of a pile of empty brown cardboard boxes of different sizes stacked carefully on top of a standard wooden shipping pallet against a clean, plain white background, representing logistics, delivery, and storage. Rectangular stack illustrations
A studio shot of a pile of empty brown cardboard boxes of different sizes stacked carefully on top of a standard wooden shipping pallet against a clean, plain white background, representing logistics, delivery, and storage. Rectangular stack illustrations
A close-up shot of three rectangular slices of lemon drizzle cake, perfectly stacked, each topped with a bright yellow, glossy icing. The cake has a light, airy texture, and the white background emphasizes its golden hue and the vibrant color of the frosting. Rectangular stack vectors
A close-up shot of three rectangular slices of lemon drizzle cake, perfectly stacked, each topped with a bright yellow, glossy icing. The cake has a light, airy texture, and the white background emphasizes its golden hue and the vibrant color of the frosting. Rectangular stack vectors
A thick pile of pristine white rectangular sheets rests on a flat surface. This macro perspective highlights the sharp corner where individual layers create precise parallel lines. Soft natural lighting emphasizes the clean texture and crisp edges of the cellulose material. The minimalist composition conveys professional organization, academic study, or creative preparation. Rectangular stack illustrations
A thick pile of pristine white rectangular sheets rests on a flat surface. This macro perspective highlights the sharp corner where individual layers create precise parallel lines. Soft natural lighting emphasizes the clean texture and crisp edges of the cellulose material. The minimalist composition conveys professional organization, academic study, or creative preparation. Rectangular stack illustrations
A stack of pastel colored soap bars in various shapes and sizes. The soap bars are arranged in a pyramid shape, with some rectangular and others rounded. The colors range from soft pink, blue, yellow, green, and gray. The background is a gradient of pastel colors, matching the soap bars. This image can be used for advertising or showcasing soap products. Rectangular stack illustrations
A stack of pastel colored soap bars in various shapes and sizes. The soap bars are arranged in a pyramid shape, with some rectangular and others rounded. The colors range from soft pink, blue, yellow, green, and gray. The background is a gradient of pastel colors, matching the soap bars. This image can be used for advertising or showcasing soap products. Rectangular stack illustrations
A collection of three distinct decorative frames isolated on a white background. The first frame is rectangular, adorned with stacks of folded towels. The second is an arched frame also featuring towel stacks. The third is a rectangular frame decorated with elegant, flowing fabric drapes in teal and gold tones. These illustrations are perfect for spa-themed designs, interior decor projects, bathroom advertisements, or creative framing for text and images. The clean, vector-style lines and professional color palette make them versatile for both digital and print media applications. Rectangular stack vectors
A collection of three distinct decorative frames isolated on a white background. The first frame is rectangular, adorned with stacks of folded towels. The second is an arched frame also featuring towel stacks. The third is a rectangular frame decorated with elegant, flowing fabric drapes in teal and gold tones. These illustrations are perfect for spa-themed designs, interior decor projects, bathroom advertisements, or creative framing for text and images. The clean, vector-style lines and professional color palette make them versatile for both digital and print media applications. Rectangular stack vectors
A close-up, studio shot features three minimalist, white ceramic objects stacked vertically on a plain grey background. Each object has a smooth, matte finish and features circular or rectangular openings. The bottom piece is the largest and roundest with a large circular opening. The middle piece is flatter and wider with a rectangular slot. The top piece is the smallest and most spherical, with a smaller circular opening. This composition evokes simplicity, modern design, and a sense of calm, making it suitable for decor, aromatherapy, or lifestyle themes. Rectangular stack illustrations
A close-up, studio shot features three minimalist, white ceramic objects stacked vertically on a plain grey background. Each object has a smooth, matte finish and features circular or rectangular openings. The bottom piece is the largest and roundest with a large circular opening. The middle piece is flatter and wider with a rectangular slot. The top piece is the smallest and most spherical, with a smaller circular opening. This composition evokes simplicity, modern design, and a sense of calm, making it suitable for decor, aromatherapy, or lifestyle themes. Rectangular stack illustrations
Two stacks of white paper sheets are neatly arranged on a plain, white surface. The larger stack is in the foreground, while the smaller stack is placed on top of it. Rectangular stack illustrations
Two stacks of white paper sheets are neatly arranged on a plain, white surface. The larger stack is in the foreground, while the smaller stack is placed on top of it. Rectangular stack illustrations
This stylized illustration features a geometric cube outline filled with swirling blue water patterns. Inside the cube, a smaller, simplified building icon is depicted. To the right, a stack of abstract rectangular shapes, also in blue, suggests data or layers. The overall design is modern, clean, and uses a limited color palette of blues and white, conveying concepts of data flow, digital architecture, or abstract concepts. Rectangular stack illustrations
This stylized illustration features a geometric cube outline filled with swirling blue water patterns. Inside the cube, a smaller, simplified building icon is depicted. To the right, a stack of abstract rectangular shapes, also in blue, suggests data or layers. The overall design is modern, clean, and uses a limited color palette of blues and white, conveying concepts of data flow, digital architecture, or abstract concepts. Rectangular stack illustrations
The image shows two neatly folded white towels stacked on top of each other. The towels appear to be made of a soft, absorbent material and have a subtle texture. They are folded in a compact rectangular shape and are placed on a plain white background, which helps to highlight their color and texture. Rectangular stack illustrations
The image shows two neatly folded white towels stacked on top of each other. The towels appear to be made of a soft, absorbent material and have a subtle texture. They are folded in a compact rectangular shape and are placed on a plain white background, which helps to highlight their color and texture. Rectangular stack illustrations
Four handcrafted natural soap bars are stacked on a textured linen background. The soaps vary in color — cream, light brown with speckles, orange, and green — and have a smooth, rectangular shape. The linen provides a soft, neutral backdrop, enhancing the rustic and organic appearance of the soaps. Each bar has a simple, artisanal look, indicating the use of natural ingredients. Rectangular stack illustrations
Four handcrafted natural soap bars are stacked on a textured linen background. The soaps vary in color — cream, light brown with speckles, orange, and green — and have a smooth, rectangular shape. The linen provides a soft, neutral backdrop, enhancing the rustic and organic appearance of the soaps. Each bar has a simple, artisanal look, indicating the use of natural ingredients. Rectangular stack illustrations
A neatly stacked assortment of rectangular shortbread cookies featuring a layer of chocolate filling. Each cookie is topped with pecan halves, giving a rich and textured appearance. The cookies are golden brown, indicating a perfectly baked and crispy texture. Rectangular stack illustrations
A neatly stacked assortment of rectangular shortbread cookies featuring a layer of chocolate filling. Each cookie is topped with pecan halves, giving a rich and textured appearance. The cookies are golden brown, indicating a perfectly baked and crispy texture. Rectangular stack illustrations
A pile of gray concrete cinder blocks is scattered on a white background. The blocks are rectangular with hollow cores and a rough, textured surface. They are arranged in a seemingly random, jumbled heap. Rectangular stack illustrations
A pile of gray concrete cinder blocks is scattered on a white background. The blocks are rectangular with hollow cores and a rough, textured surface. They are arranged in a seemingly random, jumbled heap. Rectangular stack illustrations
The image shows three rectangular blocks of white cheese stacked on top of each other. The cheese has a slightly rough texture with numerous small holes throughout. The blocks are neatly aligned, with the top block slightly offset to reveal the layers beneath. Rectangular stack illustrations
The image shows three rectangular blocks of white cheese stacked on top of each other. The cheese has a slightly rough texture with numerous small holes throughout. The blocks are neatly aligned, with the top block slightly offset to reveal the layers beneath. Rectangular stack illustrations
Three rectangular gold bars are stacked in a triangular formation against a pure white background. The bars are uniformly golden yellow, exhibiting a smooth, shiny surface with subtle highlights suggesting a metallic texture. The perspective is slightly angled, allowing for a clear view of the bars' dimensions and reflective qualities. The image is clean and simple, with no shadows or other. Rectangular stack illustrations
Three rectangular gold bars are stacked in a triangular formation against a pure white background. The bars are uniformly golden yellow, exhibiting a smooth, shiny surface with subtle highlights suggesting a metallic texture. The perspective is slightly angled, allowing for a clear view of the bars' dimensions and reflective qualities. The image is clean and simple, with no shadows or other. Rectangular stack illustrations
Shiny gold bars stacked on a white background. Each bar is engraved with identifiers: "GLD," "LB12346," "LB1246," and "LB1245. " The bars have a lustrous finish and rectangular shape with beveled edges, commonly associated with wealth and investment. The arrangement emphasizes their sleek design, reflecting light to highlight their premium quality. Rectangular stack vectors
Shiny gold bars stacked on a white background. Each bar is engraved with identifiers: "GLD," "LB12346," "LB1246," and "LB1245. " The bars have a lustrous finish and rectangular shape with beveled edges, commonly associated with wealth and investment. The arrangement emphasizes their sleek design, reflecting light to highlight their premium quality. Rectangular stack vectors
A close-up shot of a neatly stacked assortment of vibrant sticky notes, showcasing a spectrum of colors, elegantly placed on a rustic wooden surface. This image is perfect for conveying a sense of. Rectangular stack illustrations
A close-up shot of a neatly stacked assortment of vibrant sticky notes, showcasing a spectrum of colors, elegantly placed on a rustic wooden surface. This image is perfect for conveying a sense of. Rectangular stack illustrations
A large stack of various structural steel products including I-beams, square tubes, round pipes, angle irons and channel profiles isolated on white background. The dark gray metallic materials are neatly piled showing different sizes and cross-sections. Ideal concept for construction, engineering, manufacturing, metallurgy and industrial supply. Perfect for use in catalogs, presentations and advertising related to building materials, infrastructure and steel industry. Rectangular stack vectors
A large stack of various structural steel products including I-beams, square tubes, round pipes, angle irons and channel profiles isolated on white background. The dark gray metallic materials are neatly piled showing different sizes and cross-sections. Ideal concept for construction, engineering, manufacturing, metallurgy and industrial supply. Perfect for use in catalogs, presentations and advertising related to building materials, infrastructure and steel industry. Rectangular stack vectors
A meticulously arranged pyramid stack of ten shiny, golden bars. Each bar is rectangular with beveled edges and reflects light, giving them a lustrous appearance. The gold bars are tightly packed, forming a stable, tiered structure. The composition is isolated against a clean white background. Rectangular stack illustrations
A meticulously arranged pyramid stack of ten shiny, golden bars. Each bar is rectangular with beveled edges and reflects light, giving them a lustrous appearance. The gold bars are tightly packed, forming a stable, tiered structure. The composition is isolated against a clean white background. Rectangular stack illustrations
The image features a neatly stacked pile of white paper sheets, arranged in a rectangular shape against a plain white background. The lighting is soft and even, highlighting the texture of the paper while casting subtle shadows that add depth to the composition. Rectangular stack illustrations
The image features a neatly stacked pile of white paper sheets, arranged in a rectangular shape against a plain white background. The lighting is soft and even, highlighting the texture of the paper while casting subtle shadows that add depth to the composition. Rectangular stack illustrations
A collection of three unique decorative frames constructed entirely from stacks of colorful vintage books. The set includes a rectangular frame, an arched doorway-style frame, and an octagonal frame, all featuring detailed book spines in shades of blue, red, and cream. These artistic illustrations are perfect for educational projects, library-themed designs, literary events, or creative invitations. The clean white background allows for easy integration into various graphic design layouts, providing a whimsical and intellectual aesthetic for book lovers and students alike. Rectangular stack vectors
A collection of three unique decorative frames constructed entirely from stacks of colorful vintage books. The set includes a rectangular frame, an arched doorway-style frame, and an octagonal frame, all featuring detailed book spines in shades of blue, red, and cream. These artistic illustrations are perfect for educational projects, library-themed designs, literary events, or creative invitations. The clean white background allows for easy integration into various graphic design layouts, providing a whimsical and intellectual aesthetic for book lovers and students alike. Rectangular stack vectors
This image showcases a minimalist living room setup featuring a wooden console table against a light-colored wall. The table is adorned with various decorative items, including a white vase with dried grasses, a small sculpture, and a stack of books. Above the table, two black pendant lights with exposed bulbs hang, casting a warm glow. A large, rectangular framed mirror with a wooden border is. Rectangular stack illustrations
This image showcases a minimalist living room setup featuring a wooden console table against a light-colored wall. The table is adorned with various decorative items, including a white vase with dried grasses, a small sculpture, and a stack of books. Above the table, two black pendant lights with exposed bulbs hang, casting a warm glow. A large, rectangular framed mirror with a wooden border is. Rectangular stack illustrations
A vibrant stack of translucent storage containers in bright colors catches the evening sun, suggesting organization and household needs For use in storage and lifestyle content. Rectangular stack illustrations
A vibrant stack of translucent storage containers in bright colors catches the evening sun, suggesting organization and household needs For use in storage and lifestyle content. Rectangular stack illustrations
Clear rectangular glass sheets form a low stack, with bright ceiling reflections and a softly blurred industrial background. This image was generated using AI. Rectangular stack illustrations
Clear rectangular glass sheets form a low stack, with bright ceiling reflections and a softly blurred industrial background. This image was generated using AI. Rectangular stack illustrations
The image features a neat arrangement of white business cards and envelopes on a plain gray background. There are multiple stacks of business cards and envelopes, each varying in size and orientation. The business cards are primarily rectangular, while the envelopes are slightly larger and have a flap. The overall presentation is clean and professional, suitable for business or corporate use. Rectangular stack illustrations
The image features a neat arrangement of white business cards and envelopes on a plain gray background. There are multiple stacks of business cards and envelopes, each varying in size and orientation. The business cards are primarily rectangular, while the envelopes are slightly larger and have a flap. The overall presentation is clean and professional, suitable for business or corporate use. Rectangular stack illustrations
A collection of stacked cardboard boxes in different sizes and shapes, representing shipping, moving, and storage solutions for businesses and individuals. Generative AI. Rectangular stack vectors
A collection of stacked cardboard boxes in different sizes and shapes, representing shipping, moving, and storage solutions for businesses and individuals. Generative AI. Rectangular stack vectors
The image displays three packs of disposable wipes arranged in a triangular formation against a white background. Each pack features a different color: white, yellow, and green. The white pack is positioned on the left, the yellow pack is at the top right, and the green pack is at the bottom right. All packs have a similar design with a rectangular shape and a flip-top lid. The lids are open,. Rectangular stack illustrations
The image displays three packs of disposable wipes arranged in a triangular formation against a white background. Each pack features a different color: white, yellow, and green. The white pack is positioned on the left, the yellow pack is at the top right, and the green pack is at the bottom right. All packs have a similar design with a rectangular shape and a flip-top lid. The lids are open,. Rectangular stack illustrations
This image showcases a modern and minimalist entryway featuring a sleek wooden console table against a textured wall. The table holds a decorative vase with dried grasses and eucalyptus, a small bowl, and a stack of books. Above the table, a rectangular mirror is mounted on the wall, reflecting light into the space. To the right, a small potted olive tree sits on a woven chair, adding a touch of greenery. The design is ideal for interior inspiration, home decor, and creating a welcoming entrance in residential or commercial spaces. Rectangular stack illustrations
This image showcases a modern and minimalist entryway featuring a sleek wooden console table against a textured wall. The table holds a decorative vase with dried grasses and eucalyptus, a small bowl, and a stack of books. Above the table, a rectangular mirror is mounted on the wall, reflecting light into the space. To the right, a small potted olive tree sits on a woven chair, adding a touch of greenery. The design is ideal for interior inspiration, home decor, and creating a welcoming entrance in residential or commercial spaces. Rectangular stack illustrations
A collection of various torn white paper pieces, scraps, notes, and frames arranged on a neutral light background. The composition includes rectangular shapes, a photo frame, a curved corner note, and layered fragments, all featuring realistic ragged edges and soft drop shadows. This versatile design element is ideal for scrapbooking, creative design projects, mockups, messages, journaling backgrounds, digital collages, and artistic presentations requiring a tactile, handmade aesthetic. Rectangular stack illustrations
A collection of various torn white paper pieces, scraps, notes, and frames arranged on a neutral light background. The composition includes rectangular shapes, a photo frame, a curved corner note, and layered fragments, all featuring realistic ragged edges and soft drop shadows. This versatile design element is ideal for scrapbooking, creative design projects, mockups, messages, journaling backgrounds, digital collages, and artistic presentations requiring a tactile, handmade aesthetic. Rectangular stack illustrations
Two blank rectangular sheets of textured stationery paper are stacked slightly askew on a rough, fibrous background surface. The paper is off-white, showcasing a subtle natural texture, suggesting high-quality, possibly handmade paper. The rough background texture complements the paper's aesthetic, highlighting its grain and natural fibers. The minimalistic composition focuses on the tactile quality of the materials. Rectangular stack illustrations
Two blank rectangular sheets of textured stationery paper are stacked slightly askew on a rough, fibrous background surface. The paper is off-white, showcasing a subtle natural texture, suggesting high-quality, possibly handmade paper. The rough background texture complements the paper's aesthetic, highlighting its grain and natural fibers. The minimalistic composition focuses on the tactile quality of the materials. Rectangular stack illustrations
A minimalist display features a rectangular marble pedestal with gray veining. On top, there's a bottle of perfume labeled "Éclat du Jour" with a clear glass body and metallic cap, filled with amber-colored liquid. Beside it, a small stack of books adds to the elegant presentation. The background is a plain, light-colored wall, giving the setup a clean, contemporary look. The scene conveys a sense of luxury and simplicity. Rectangular stack illustrations
A minimalist display features a rectangular marble pedestal with gray veining. On top, there's a bottle of perfume labeled "Éclat du Jour" with a clear glass body and metallic cap, filled with amber-colored liquid. Beside it, a small stack of books adds to the elegant presentation. The background is a plain, light-colored wall, giving the setup a clean, contemporary look. The scene conveys a sense of luxury and simplicity. Rectangular stack illustrations
This image features three rectangular picture frames, each with a distinct color: orange, teal, and gray. The frames are arranged in a vertical stack with the orange frame in the front, the teal frame in the middle, and the gray frame in the back. The image is set against a transparent background, making it suitable for various design applications. Rectangular stack illustrations
This image features three rectangular picture frames, each with a distinct color: orange, teal, and gray. The frames are arranged in a vertical stack with the orange frame in the front, the teal frame in the middle, and the gray frame in the back. The image is set against a transparent background, making it suitable for various design applications. Rectangular stack illustrations
This image showcases a stack of three rectangular granola bars featuring a golden-brown exterior. The bars have a crunchy texture with visible seeds and a hint of honey glaze, suggesting a sweet and nutritious snack option. The top bar is partially separated, revealing the inner layers and texture details. Rectangular stack illustrations
This image showcases a stack of three rectangular granola bars featuring a golden-brown exterior. The bars have a crunchy texture with visible seeds and a hint of honey glaze, suggesting a sweet and nutritious snack option. The top bar is partially separated, revealing the inner layers and texture details. Rectangular stack illustrations
The image shows three identical green rectangular blocks stacked directly on top of each other. The blocks are solid, opaque, and have a matte finish. The top block is slightly offset to the right, creating a small step-like effect where the middle block is partially visible. The blocks appear to be made of a material resembling plastic or wood, and they have no visible seams or textures other. Rectangular stack vectors
The image shows three identical green rectangular blocks stacked directly on top of each other. The blocks are solid, opaque, and have a matte finish. The top block is slightly offset to the right, creating a small step-like effect where the middle block is partially visible. The blocks appear to be made of a material resembling plastic or wood, and they have no visible seams or textures other. Rectangular stack vectors
A collection of gift boxes in various shapes and sizes is arranged on a flat surface. The boxes are predominantly in shades of red, with one white cylindrical box on top. A rectangular box features a red and white polka dot pattern. Two smaller red boxes are adorned with white ribbon bows. The background is a gradient from dark to light red, creating a festive and elegant atmosphere. Rectangular stack illustrations
A collection of gift boxes in various shapes and sizes is arranged on a flat surface. The boxes are predominantly in shades of red, with one white cylindrical box on top. A rectangular box features a red and white polka dot pattern. Two smaller red boxes are adorned with white ribbon bows. The background is a gradient from dark to light red, creating a festive and elegant atmosphere. Rectangular stack illustrations