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

Optical Illusion Art: 5 Mind-Bending Works by Victor Vasarely

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Visual Optical Illusion Test: Are the Red Lines Straight or Curved?

25 Optical Illusions That Prove Your Brain Sucks

There are 12 black dots in this optical illusion but you can't see them all at once

This optical illusion made of straight lines may show you something else. Brain is bleeding, says Internet - India Today

Straight lines look wavy in this striking optical illusion - Boing Boing

Warping Cushion Effect

How to draw a buried object optical illusion - B+C Guides

v2.0 - Encore update: new illusions, Ultimate Shuffle, and more! - Fake Illusions - Encore Update by Auroriax (Tom H.)

NEMO Science Museum

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

30 Optical Illusions That Will Make Your Brain Hurt

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30 Optical Illusions That Will Make Your Brain Hurt