1. Collection of Optical Illusions:
Pinwheel

This animated optical illusion called "Pinwheel" was created by Troy Zerr, ©1995.

Pinwheel

Screenshot of the Pinwheel application

 

Proceed as follows

  1. Download the file pinwheel.zip.
  2. Execute the program on your PC.
  3. Concentrate on the center of your screen for about half a minute.
  4. Now take a look at any nearby object. Do you notice a change in your perception?

 

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Source:  Optical Illusions