Full Idea
Mereological Nominalism has some plausibility for a case like whiteness, but breaks down completely for other universals, such as squareness.
Clarification
'Mereological' means explaining relationships between parts and whotes
Gist of Idea
'Mereological Nominalism' may work for whiteness, but it doesn't seem to work for squareness
Source
David M. Armstrong (Universals [1995], p.503)
Book Reference
'A Companion to Metaphysics', ed/tr. Kim,Jaegwon/Sosa,Ernest [Blackwell 1995], p.503
A Reaction
A delightful request that you attempt a hopeless feat of imagination, by seeing all squares as parts of one supreme square. A nice objection.