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 distortion 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.