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An experiment that I have found interesting:
When you are bored in a large lecture hall (or church or whatever)
that has rotating ceiling fans.
try to count the blades.
usually they are moving slightly too fast to do this easily.
Blink your eyes. When your eyes close, they retain a still
image of the last thing seen for a short time.
Concentrate on the image seen in your memory and you can now
(maybe) count the blades on the fan when you couln't before.
Sometimes it helps to blink your eyes as rapidly as you can,
repeatedly, and you can actually see the strobe effect.
Oren Quist
SDSU