Page 1 of 2
An optical illusion is
characterized by visually perceived
images that, at least in common sense terms, are deceptive or
misleading. Therefore, the information gathered by the eye is
processed by the brain to give, on the face of it, a
percept that does not tally with a
physical measurement of the stimulus source. A conventional
assumption is that there are physiological illusions that occur
naturally and cognitive illusions that can be demonstrated by
specific visual tricks that say something more basic about how human
perceptual systems work.
I have not given
appropriate credit to any of the sources yet. That is an on-going
project. I will add credits as I discover them. Click on the picture
for a larger view.
The images shown here
are a sampling of what is available on the web.