Optical Illusion Question Mark Card

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This 3D-printed question mark creates a striking optical illusion, flipping between positive and negative reliefs as you change your viewing angle. It’s quick to print and perfect for leaving in unexpected places—guaranteed to surprise and intrigue whoever finds it. Important: Print this using the Arachne engine; classic wall generation won’t work and will leave you with a blank card. The effect is hard to capture in photos—it’s something you need to hold in your hand to fully appreciate. A simple yet fascinating piece that’s sure to leave an impression, or will it?