With numbers arranged as forms you can show arguments and can conduct visual proofs for theorems. For example, if you start with one white stone and arrange all following odd numbers around the former, you will always get a square.

	Arithmetic and Weaving in Antiquity A pebble proof of the incommensurability in the square

	With numbers arranged as forms you can show arguments and can conduct visual proofs for theorems. For example, if you start with one white stone and arrange all following odd numbers around the former, you will always get a square.