dug 
When I read Tim’s post on the Budapest panoramic I searched for the image to add a lovely png to his post. Unfortunately the image site asks you to download Silverlight and I have a personal policy on Air and Silverlight apps so in the end I couldn’t see the image.
That said, in the process of searching I stumbled on this spherical Escher movie
Tribute to Escher in Barcelona
Click on the “up” and “down” arrows to have your head messed with:-)
