Full Idea
My four-dimensionalism implies the existence of temporal parts, but not that those parts are more fundamental, nor that the object is 'constructed' from its parts, nor that identity over time is reducible to parts.
Gist of Idea
Temporal parts exist, but are not prior building blocks for objects
Source
Theodore Sider (Four Dimensionalism [2001], 3.2)
Book Reference
Sider,Theodore: 'Four Dimensionalism' [OUP 2003], p.60
A Reaction
That's a rather negative account of temporal parts, which makes you ask what their positive role could be. Do they contribute anything to our understanding of a temporally extended object?