stare at the red dot. do not move.
(scintillating grid — the gray dots that appear in your peripheral vision are not on this page. they are in your mind. your eyes lie to you constantly. this is one of those times.)
now stare at the center of the wheel:
(now look at any stationary object. it should appear to move in the opposite direction. you have been deceived by your own visual cortex. there is no recourse.)
stare at the magenta circle for 30 seconds. then look at a white wall.
(you will see a green-and-pink afterimage of this page. it may haunt you for several minutes. the webmaster apologizes for nothing.)
side effects may include: