Visual Test
Have a look at these color boomerangs (arcs of circle). Which one of them is the widest and which is the thickest?
More visual tests: https://t.co/rElnF80BR5

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Patterned ball rolling along the same surface. Abstract and tile of seamless wallpaper. https://t.co/8SiJEad6yb

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Distorted Checkerboard
Alternating cross patterns make the columns of the checkerboard diverge (click to enlarge the picture to see the visual effect)
Image taken from my book "Fantastic Optical Illusions": https://t.co/TlpwIn69W0

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There are stairs that go up whatever direction you are facing... Illustration taken from my little children's book Eye Bogglers. Available here: https://t.co/xWP1Pul5lF

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"Souvenir d'Utopialand" (1985), an optical illusion illustration I created for a French children's book.

All my optical illusion books on Amazon: https://t.co/pCaQMoG4tI

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A sphere is rotating around of a moving hyperboloid. Abstract fantasy in a surreal style. | Adobe Stock https://t.co/L6rZvsSEaH

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Gotta look real hard at the depiction

The concept is:
I learned how to use blending mode: color burn

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CREATIVE TIP: With this simple tip you can make optical illusion 3D linked stripe shape in Adobe Illustrator.
https://t.co/6ym2vjGwvm

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