A false impression or delusion, or a misinterpreted perception of an actual form of object.

Many critics of spiritualism believe that alleged "psychic materializations" are sleight-of-hand illusions involving physical objects that have no supernatural origin whatever.

The perception of ghosts, spirits, or witches in the branches of a tree on a dark and stormy night, or in the flickering flames of fire, may similarly be illusory, and the product of one's imagination.

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