Tony Cragg’s work, throwing together everyday objects in unexpected combinations, seems the result of some catastrophe, an explosion, perhaps; and an explosion can have many different effects. Typical of his art, all of which shown here was from 1984, are two montages of plastic bits and pieces, hung on the wall in a form of drawing; and a spiral path, composed of a variety of wood objects arranged according to height, which runs from the floor to the top of the cupboard that makes up the last step (or, going in the other direction, the first). The two wall pieces, one of which was located at