I'm working in Trafalgar Square at the moment which is really handy for going to galleries at lunchtime Today I went to the National Gallery and was particularly blown away by Hoogstraaten's peepshow, a 3 dimension box with an amazing trompe l'oeuil which appears to be 3 dimensional when you have a good peep. It really is amazing, thankfully one side is open so you can see inside and see how it's done, otherwise I am sure you would be convinced it was doll's house filled with models. Really amazing stuff