 Why, though, should anyone accept AV4? On the face of it, it seems just as clear that there can be borderline cases of composition (e.g., when the hammer head is just beginning to be affixed to the handle) as it is that there can be borderline cases of redness and baldness. This is not, however, “just another sorites,” to be blocked in whichever way one blocks the sorites arguments in §2.1. That’s because questions about when composition occurs look to be intimately bound up with questions about how many objects exist. This suggests the following line of argument in defense of AV4, no analogue of which is available for other sorts of sorites  arguments.[18]