If you haven't yet visited the Lynette Yiadom-Boakye exhibition at the New Museum you have got to make it happen. It's a small show – warm and entirely enriching. Just head down there on your lunch break, or for half an hour after work – it will absolutely make your day. The exhibition is called Under-Song For A Cipher, a cipher being something secretive, kept on the down-low. Yiadom-Boakye paints a series of black, imagined figures – imagined because none of these people are