 In general, our task here is to set aside the purely mereological controversies (see the entry on  mereology)  and to focus instead on the issues that are exclusively concerned with location and its interaction with parthood. Too much of the controversy over (1) arises from controversy over ‘pure mereology’. By contrast, if No Interpenetration is controversial, this is only because of what it says about the connections between parthood and location.