 According to one view, material objects persist by having temporal parts or stages, which exist at different times and are to be distinguished by the times at which they exist – this is known as the view that material objects perdure. Other philosophers deny that this is so; according to them, when a material object exists at different times, it is wholly present at those times, for it has no temporal parts, but only spatial parts, which likewise are wholly present at the different times they exist. This is known as the view that material objects endure.