Now! High quality version at https://www.youtube.com/watch?v=P1ww1IXRfTA Richard Feynman amuses himself with an old puzzle - why do mirrors seem to switch left and right, but not top and bottom? From the BBC TV series 'Fun To Imagine' (1983). You can now watch higher quality versions of some of these episodes at www.bbc.co.uk/archive/feynman/