From the wiki:
Pareidolia ( /pærɨˈdliə/ parr-i-doh-lee-ə) is a psychological phenomenon involving a vague and random stimulus (often an image or sound) being perceived as significant. Common examples include seeing images of animals or faces in clouds, the man in the moon or the Moon rabbit, and hearing hidden messages on records played in reverse. The word comes from the Greek para- – "beside", "with", or "alongside"—meaning, in this context, something faulty or wrong (as in paraphasia, disordered speech) and eidōlon – "image"; the diminutive of eidos – "image", "form", "shape". Pareidolia is a type of apophenia.
Religious people seem particularly prone to pareidolia. Catholics see the Virgin Mary in a grilled cheese sandwhich,

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I thought of this psychological disorder after viewing this video that explains how the Rapture, WW III, the Mark of the Beast and the Whore of Babylon are all depicted on the One Dollar Bill: