 So the two standard views of persistence are endurance and perdurance theories. But there are also non-standard views.  According to mixed views, some persisting objects have temporal parts, and others do not. For example, perhaps changing objects have temporal parts, whilst objects with unchanging intrinsic natures do not. Or perhaps ontologically self-sufficient things like organisms don’t have temporal parts, but ontologically dependent things like ocean waves, smiles or universities do. (Most endurantists, perdurantists and others agree that processes or events have temporal parts: whether or not I have earlier and later parts, my birthday party certainly does.)