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Illusion

The café wall illusion: the horizontal lines are parallel, despite appearing to be at different angles to each other
Illusionː The Flying tap fountain in Ahmedabad seems to hang in the air. In reality, there is a tube in the middle of the water, which supports it.

An illusion is a change of perception. The brain arranges, sorts, and organises data from the senses. Normally the system works well. Sometimes it does not, and we see illusions. In general, they are shared by most people in the same situation.

Illusions can happen with all five senses (taste, touch, sight, smell, and hearing), and some involve the way information from two senses is put together. Some illusions happen because of disorders, but generally, all normal people can sense the same illusion. An illusion is different from a hallucination; a hallucination is sensing something that is not real, but an illusion is interpreting what we sense wrongly.

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