 Lewis favors a different solution to the problem of temporary intrinsics (Lewis 1986). Whether or not there is a problem with the same object being round and square, there is no problem with the same object having a round part and a square part. To solve the problem of temporary intrinsics, Lewis invokes the view that, in addition to their spatial parts, objects have temporal parts or stages. This allows him to hold that Plate is round at t1 and square at t2 because Plate has a round part at t1 and a square part at t2. Plate's round t1 part exists only at t1, and Plate's square t2 part exists only at t2. Hence there is no problem posed by either temporal part changing its shape. Plate itself is an object consisting of a suitably interrelated sequence of such temporal parts. For the t1 temporal part of Plate to be round is just for it to be round. For the longer lived Plate to be round at t1 is for Plate to be appropriately related to a round temporal part at t1.