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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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Optical illusion of some dunes or mounds probably.
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.
Imagination. Just as you think you can see familiar objects in the clouds, only this time it is in the shadows.
Not what you might be thinking of:
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