 It seems plausible that at least in some cases where one entity is more fundamental than another one, it is because the less fundamental is ontologically dependent on the more fundamental. Much of the recent discussion involving ontological dependence has focused exactly on the question of fundamentality and especially the question mentioned above, namely whether there is something that is entirely fundamental, ontologically independent—is there an ontological “bottom level”? Hence, there are two senses in which a clearer understanding of ontological dependence may help: we can specify in what sense fundamental entities are ontologically independent as well as how other entities may be ontologically dependent on the fundamental entities, thus gaining further understanding of the supposed “hierarchy” that terminates in the bottom level.