Full Idea
Intuitively, an object's parts at one level of decomposition are parts of that object that do not overlap and that, collectively, fill the whole region the object fills.
Gist of Idea
Objects decompose (it seems) into non-overlapping parts that fill its whole region
Source
Trenton Merricks (Objects and Persons [2003], §1.II)
Book Reference
Merricks,Trenton: 'Objects and Persons' [OUP 2003], p.10
A Reaction
A nice case where 'intuition' must be cited as the basis for the claim, and yet it is hard to see how anyone could possibly disagree. Exhibit 73 in favour of rationalism. This ideas shows the structure of nature and the workings of our minds.
Related Idea
Idea 22930 Lengths do not contain infinite parts; parts are created by acts of division [Aristotle, by Le Poidevin]