 Can OD6 be resisted? The idea would have to be that, although some events are caused both by atoms and by baseballs composed of those atoms, those events are not overdetermined (in the indicated sense). But if they are not overdetermined, then which of the five conditions for overdetermination do the baseball and the atoms fail to meet? This line of response takes for granted that (i) and (ii) are satisfied. And it is extremely plausible that (iii) and (iv) would be satisfied as well. However it is that baseballs “get in on the action”, it isn’t by entering into the causal explanation of how the atoms manage to cause things. Baseballs don’t cause their atoms to shatter windows, nor do their atoms cause them to shatter windows. So those who would deny OD6 will need to deny that condition (v) is satisfied, by taking the baseball to be identical to the atoms. See  §3.3  below for discussion of the thesis that objects are identical to their various parts.