The Genius of Photography starts tonight on BBC4 at 9pm - promises to be an interesting series

http://www.bbc.co.uk/photography/genius/programmes.shtml

for those not in the UK here's a taster posted on You Tube from the series - Making a Camera Obscura.

http://www.youtube.com/view_play_list?p=B045F7E8E0E101C2

And every one said, 'If we only live,
We too will go to sea in a Sieve,---
To the hills of the Chankly Bore!'
Far and few, far and few, Are the lands where the Jumblies live;
Their heads are green, and their hands are blue, And they went to sea in a Sieve.

Edward Lear
http://www.nonsenselit.org/Lear/ns/jumblies.html