You do not see with your eyes alone, but with your brain and mind, which sorts out the confusion of outlines and colors and forms them into definite, understandable images.
Because the mind has so very much to do with what is being observed, deception is made possible.
We see what we expect to see and it is difficult to recognize anything we are not prepared to encounter. If we ran across a polar bear in a field near Chicago, we would likely recognize it as a large white boulder, until it moved or we got close to it.
But if we knew a bear had escaped from a circus and we were searching for it, we might at first identify a rock as a bear.
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