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An illusion is a misinterpreted perception that is caused by mistaking something present for something it is not. Illusions commonly occur with information that is seen or heard. For example, a common illusion is misinterpreting the noise made by wind for a voice. By contrast, a hallucination is a strong sensory perception that one has of an object or event while awake, when no such object or event exists. Whereas illusions involve misperceptions, hallucinations do not. Thus, an example of a hallucination would be hearing voices that are not really there and are not misinterpretation of the wind or any other noises. Illusion comes from the Latin word “illudere” meaning to mock.

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