Very understandable. You know, a while ago, after one of the first photo-mapping missions to Mars, a lot of people - even experts - got all excited about an unusual rock formation on the planet's surface, claiming that it looked so much like a human face that it "must have been" carved by an intelligent being. Turns out that it was simply another example of folks observing an optical illusion produced by shadow effects similar to what we are discussing. I guess the upshot is that people just can't trust their lyin' eyes sometimes, eh?
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