These are two classic examples of literal optical illusion. In this first photo, there are two possible ways to perceive it: a rocky side of mars or a human face protruding from the ground. The image of the human's face is made up the smaller pieces of rocks and craters, and the rocks and craters are no way related to the human face. Again, literal optical illusion occurs in this second photo of the sky. One can either see three birds or a face in the sky, and the face in the sky is made up of the birds.
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