Full Idea
An object is not made up of its spatial parts: spatial parts are regions of some object. ...Complex objects, wholes, are made up of, and so depend on, their substantial parts.
Gist of Idea
Spatial parts are just regions, but objects depend on and are made up of substantial parts
Source
John Heil (The Universe as We Find It [2012], 03.1)
Book Reference
Heil,John: 'The Universe as We Find It' [OUP 2012], p.35
A Reaction
Presumably objects also 'depend on' their spatial parts, so I am not convinced that we have a sharp distinction here.