Full Idea
The problem is how a group of resembling tropes can be of the same type, that is, that they can resemble one another in the same way. This problem is not settled simply by positing tropes.
Gist of Idea
How do a group of resembling tropes all resemble one another in the same way?
Source
Cynthia Macdonald (Varieties of Things [2005], Ch.6)
Book Reference
Macdonald,Cynthia: 'Varieties of Things' [Blackwell 2005], p.235
A Reaction
There seems to be a fundamental fact that there is no resemblance unless the respect of resemblance is specified. Two identical objects could still said to be different because of their locations. Is resemblance natural or conventional? Consider atoms.