1. Collection of Optical Illusions:

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


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