of the Finger Lakes, Rochester, and Ithaca, NY.
We've read about the "Waterfall Illusion" and seen demonstrations in museums and on the Internet, but we didn't really appreciate it until we saw it at a real waterfallthe Upper Falls of the Genesee River in Rochester, NY. Since then, we have noticed this illusion at lots of smaller waterfalls and have found lots more information on the Internet.
The Waterfall Illusion is also known as the motion after-effect illusion. If you stare at a waterfall for about 20 seconds, when you then look at a stationary object, the object seems to be moving in the opposite direction.
|Here is a simple demonstration you can try for yourself:|
For even more amazing demonstrations and an explanation of
why this happens,
visit the following web pages:
But do get out and stare at a real waterfall for a while!
Here are some other illusions we like a lot.
with questions or comments about this web site.
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Last modified: 02/05/2007