Cambridge is full of open-air art and no doubt I'll be showing you more than you'd ever want to see in the coming months but this one's great. It's in the grounds of Clare College's Memorial Court on the other side of the river to the main college. You can miss it if you're not looking out for it but once in you're faced with quite a beautiful building and a few decent examples of modern art of which this is a detail of my favourite. It's an aluminium sculpture, here in full, of the the double helix structure of DNA. A tribute to the discovery of said by Watson and Crick at the University's Cavendish Labs. It was created by Charles Jencks. Excitingly there's a recipe, using kiwi fruit and washing up liquid, for extracting some DNA of your own here. Not "your own" DNA of course - that would be pretty difficult and really gross, but yours to keep and chuck around...