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These zig-zags are perfectly formed on a precisely square image of exact inch dimensions but have diagonal lines crossing each of the boundary edges at sharp angles to show the squashing damage done by the application of Spoonflower's rulers.
Using the link given in the embed text under the main image (or the collection view), you can see Spoonflower's own repeated image view before squashing and check that the damage is not done by their original image reduction of my perfect repeat.
• 45° zig-zag test
• more zigzag & wave designs
• design index