Cezanne’s private puzzling – just how should masses of lemon and lead white converse? – slips into provocative teasing. No, that plate on the right could hardly have perched in that way on a three-dimensional kitchen table, and yes, the fruit on it perform a balancing act that seems outright miraculous. But painters have always reserved the right to collage their observations, and Cezanne did so with particular vehemence.