Full Idea
Some things are one by contact, some by mixture, and some by position.
Gist of Idea
Things are unified by contact, mixture and position
Source
Aristotle (Metaphysics [c.324 BCE], 1082a16)
Book Reference
Aristotle: 'Metaphysics', ed/tr. Lawson-Tancred,Hugh [Penguin 1998], p.413
A Reaction
So if several things are stuck together, or mixed together, or in the same location, that can unify them? They sound rather weak modes of unification.