 A more recent idea is that of a typically temporal property (TTP). A property is a TTP if a term predicating it is “part of a definition of being temporal or figures appropriately in the right sort of nondefining sufficient condition for being temporal” (Leftow 2002). The right sort is for example “necessarily, whatever is past was temporal” rather than “necessarily, whatever is a pig is temporal”. The thought is that just like being bipedal helps make us human without being sufficient for making us human, so, e.g., being present helps make things temporal without being sufficient for making things temporal (and so there can be an timeless eternal present a la Boethius).