Watching Stephen Wiltshire in Sydney

I've been watching via the internet the famous autistic artist Stephen Wiltshire MBE creating one of his intricate cityscape artworks during his visit to Sydney. I love the way that he holds his pen while drawing with a grip that I believe is considered by schoolteachers to be completely incorrect. What do they know, anyway?

http://www.viostream.com/autismspectrum/