Optical Illusion: Are these lines straight or do they bend?

PPT - OPTICAL ILLUSIONS PowerPoint Presentation, free download - ID:9558757

Find The Curved Line - Optical Illusion

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This Bizarre Optical Illusion Shows if You Have 'Curvature Blindness' : ScienceAlert

Wait, so is this optical illusion straight or curved?

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How many overlapping lines are there in this pic?

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Hall Of Lines - Op Art Project

Mahreen Haider Creations on X: Line Paper Optical Illusion, Line Paper 3D Trick Art

Examples of geometric-optical illusions. Upper row: (a) Classic form of

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Visual of the Optical Illusion Created from Square Lines