 Even supposing, however, that the line between objectionable and unobjectionable sorts of overdetermination can be drawn in some satisfactory way, there would still be pressure to accept OD7. We should accept that something other than the atoms shatters the window only if we have good reason to believe in this something. But there is no explanatory need to posit baseballs, since there is a complete causal explanation for all of the relevant events wholly in terms of the activities of the atoms. And the debunking arguments in  §2.6  purport to show that our ordinary perceptual reasons for believing in baseballs are no good. So we would seem to have no good reason at all to accept that there are baseballs, in which case we ought to accept  OD7.[47] 