I wouldn't call it foolish at all. It has error correction and some compromises, but overall it works pretty well. Yes, you can construct an optical illusion pr

I wouldn't call it foolish at all. It has error correction and some compromises, but overall it works pretty well. Yes, you can construct an optical illusion pretty easily, but often there is a mechanism behind it that is overall beneficial. Modern opticians do eye tests with polarized glasses with different polarization for each eye. People that have a very dominant eye get into trouble here because of error correction that happens in the brain. To test if both your glasses are correctly aligned, an image is displayed where the left side can only be seen by the left eye and vice versa for the right. To test alignment the image must fit together. The other eye only sees the background, which you can test if you close one eye. But if you have one very dominant eye, chances are that your brain deletes the image of your lesser eye after a few seconds because it must be wrong since you better eye cannot see it. You can reset this mechanism by closing your dominant eye for a while. Sure the information you see is wrong in this case, but there probably is a strong error correction running in the background. https://upload.wikimedia.org/wikipedia/commons/4/44/Optical.greysquares.arp-animated.gif https://upload.wikimedia.org/wikipedia/commons/4/44/Optical.... Here the squares A and B have the same gray value. But would the "correct" information be that they have the same color? Not in the greater context. But if perception would be that they are the same color, the brain would be quite foolish, would it not?