For questions concerning the creation and understanding of pictorial proofs.

A proof without words is a proof of an identity or mathematical statement which can be demonstrated as self-evident by a diagram without any accompanying explanatory text. Such proofs can be considered more elegant than formal or mathematically rigorous due to their self-evident nature. When the diagram demonstrates a particular case of a general statement, to be a proof, it must be generalisable.

For example, the following is a proof of the Pythagorean Theorem due to Martin Gardner.

See also: Wikipedia