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A distorted perception of reality; unlike delusions, illusions are generally shared by most people, as in a 3D “hidden picture” puzzle.

Example: A breeze stirs the curtains, you see the motion out of the corner of your eye, and you briefly think you see a lurking attacker.

APA Reference
Grinnell, R. (2018). Illusion. Psych Central. Retrieved on September 24, 2020, from