|MadSci Network: Other|
Byron, You've asked a good question that has puzzled scientists for hundreds of years! There is no absolute answer, but one possibility has to do with attention. Sometimes, those people who do not see the illusion simply are not focussing on the right parts of the image. With a little hint at what to look for, the illusion often pops out. Perhaps when you thought of this question you were thinking of the "Magic Eye" visual illusions where a hidden picture jumps out of an image when you "cross" the focus of your eyes toward the center. The trick is getting your eyes to converge like you are crossing them. Some people are very good at this naturally. Other people have trouble, but can learn with a bit of trial-and-error practice. A small percent of people just can't do it at all. These people won't be able to see the "secret" image hidden in the picture. If you have any more questions, feel free to contact me. Lori L. Holt
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