Light, shadow and illusion

This illusion is credited to Prof. Edward Adelson of Massachusetts Institute of Technology.

It shows that what we see is as much in the mind as in the eye.

If the checkerboard were really in shadow, the light square would become darker and the dark square also would become even darker.  Our brain processes the image to partially correct for this.

But there was no shadow.  The squares actually were dark and even darker, which became apparent when the square was moved.

Click on Edward Adelson for his MIT profile.

Hat tip to The Browser.

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