Full Idea
If a round ball fits snugly into a round piece of plaster, do they contain the same roundness trope, or do they contain numerically distinct but exactly similar and coinciding roundness tropes?
Gist of Idea
Does a ball snug in plaster have one trope, or two which coincide?
Source
E.J. Lowe (The Possibility of Metaphysics [1998], 9.8)
Book Reference
Lowe,E.J.: 'The Possibility of Metaphysics' [OUP 2001], p.208
A Reaction
A microscope would distinguish them, and they are made of different types of matter. Is a hole in a piece of paper a circular cut and a circular area of space? Neither example looks good for tropes.