Fibonacci was a square.

Acrylic on canvas. 75 X 75cm 2002
My parking receipts got a second go (and a serious re-colouring and re-numbering) for this picture about a number sequence. The little seed heads in that sunflower and the actual numbers on the tickets bear a mathematical relationship (that really has nothing to do with squares, and, if I had really thought about it, this image would have quite different proportions).