Ruskin reckoned that you could learn all you need to know about nature, the world and the infinite by drawing stones. The forces that formed this stone, formed mountains. As I draw it I learn about it. Following its contours with my eyes and a pencil I get to know it. Picking it up as I draw I feel its silent history. Slowly I lose myself in its rocky substance. In the act of perceiving and drawing I realise that the stone is both a substance and a play of light on a retina.

Inside every apparently solid object there is an infinity of space, just as in every mind there is an imaginative infinity.