The American artist Donald Judd is one of the most significant postwar sculptors, but the British have always found him a cerebral minimalist. Judge for yourself in the first gallery showing of Judd's work in Britain in 15 years.
It features only seven works in three rooms, but these "boxes" and wall-mounted cubes are spaciously presented. When they are given room, you understand that these are exercises not in form but in space and light: they draw you into spaces where light and the play of shadow and depth become a texture in themselves.
There is something about an open box that impels you to try and search out its corners: just stand and let them work on you.
020 3538 3165, to 19 September