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I feel it may be another Sphinx like there is at the Egyptian Pyramids. But who knows.
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Imagination. Just as you think you can see familiar objects in the clouds, only this time it is in the shadows.
Who knows. I've seen a lot of evidence for both sides of the argument, and until I'm standing on the surface of mars and looking smack-dab at whatever it is, I won't believe either one.
Not what you might be thinking of:
Optical illusion of some dunes or mounds probably.
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