As a child, Stephen was mute and did not relate to other human beings. Aged three, he was diagnosed as autistic. He had no language, uncontrolled tantrums and lived entirely in his own world.

At the age of five, Stephen was sent to Queensmill School in London, a school for children with special needs, where it was noticed that the only pastime he enjoyed was drawing. It soon became apparent he communicated with the world through the language of drawing; first animals, then London buses, and finally buildings.