Which is an ideal intro to suggest looking at this with the volume on.
http://www.youtube.com/watch?v=oTAFITUgQeI
PS
From: The UK drawing research network mailing list [mailto:[log in to unmask]] On Behalf Of derrick welsh
Sent: 15 November 2010 15:28
To: [log in to unmask]
Subject: A nice thing
Hi
You probably want to turn the sound off before clicking on this link
http://www.youtube.com/watch?v=_dnKYa7DQl4
ddw