If the picture of a square-in-a-square is woven, you actually could try to count the threads crossings (or in the case of a computer image: the pixels) in order to find out about their mathematical relations.

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

	If the picture of a square-in-a-square is woven, you actually could try to count the threads crossings (or in the case of a computer image: the pixels) in order to find out about their mathematical relations.