 One possibility is to try fixing the direction of priority even in the absence of an absolutely fundamental level (Wilson 2016: 196ff.). Drawing on a suggestion from Montero (2006: 179), Wilson proposes that analogously to an infinite sequence of numbers such as 1/2, 1/3, 1/4 … being still “bounded below” by zero, there could be an infinite descent of fundamental entities that approaches a limit whereby the limit acts as the fundamental level even though it is never reached. Related ideas may be found elsewhere in the literature (Tahko 2014; Morganti 2015; Raven 2016). One difficulty with this proposal is that applying the notion of a limit assumes that we can assign a numerical measure to the descending entities that approach this limit. So, we would need to be able to construct the hierarchical structure of relative fundamentality in such a way that this numerical measure applies to it. Moreover, even if approaching a limit does not necessarily need to be constructed numerically, the notion of a limit itself requires postulating the (fundamental) limit, in this case zero. While zero is not part of the sequence, it does seem to be part of the ontology.