LONDON - We dwell on things that won’t sit still. Why? Because memory can’t hold ambiguity in its grip for long, cannot stabilize an image that will not come to rest within its contours, much less one that refuses to align itself with the habitual formal templates in the mind’s eye, chief among them being the phantom grid that haunts all of western art. Tamper with the grid and ease the boundaries of shapes loosely teethed to it and – almost self-protectively – the senses awaken, the imagination comes alive.