If you can get to North Greenwich before the 24th September I would highly recommend the fabulous Camille Walala exhibition Wahala X Play at the Now Gallery. It's full of Memphis design and Op Art in the form of brightly coloured walls and mirrors arranged in a maze.
It is lots of fun. Before you rush off to see it, the gallery recommend pre-booking free tickets via Eventbrite. You also need to take your shoes off, so break out that brightly coloured nail varnish or socks so you can colour clash with the art!
As I left the gallery a beautiful double rainbow emerged from after a rain storm. It was so cool!