 Other non-standard views take the basic perdurantist idea that persistence is much like spatial extension, then they develop the idea in different ways. For example, perhaps persisting things stretch out four-dimensionally through time, but without being subdivided into temporal parts. Or perhaps, as stage theorists claim, the world is full of four-dimensional objects with temporal parts, but when we talk about ordinary objects like boats and people, we talk about brief temporal parts or ‘stages’ of four-dimensional objects.