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How did he pull this off?
Can you sketch this scene from the side?
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Here's the original Cafe Wall, after which the Cafe Wall Illusion was named.
What went wrong with this wall? What does every single bricklayer and tile-setter know as Rule #1, to avoid the Cafe Wall Illusion?
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How did this artist lay out the guidelines on this flat, concrete floor for this seemingly 3D artwork?
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What is the best way to show that the horizontal lines are, in fact, horizontal and parallel?
Why does your brain insist that they are not?