Optical Illusion - Vanishing and Appearing Circles!

Stare at the '+' and notice the green
dot that circles around.... which is
actually the purple dots turning off in
turn. Stare for a little longer and
notice in your peripheral vision the
purple dots completely vanish! You
can expedite the process by using only
one eye.

This is an example of how the mind doesn't really 'see' in the peripheral but rather 'remembers" what was there or creates the image from slight eye movements. Actually,one last test is to very sligh