Farewell gift for a friend who did math at Cambridge,UK and is now going off Cambridge, MIT, to do his PhD. One of my favourite equations, brought to life by Hubbard’s text. The text for the drawing is mainly from the French Wikipedia article on Stoke’s Theorem. This was done a couple of months ago. I did another one today, this time for a Physics PhD send-off, but like this one, that will have to wait till I’ve given it to him.