Has anyone seen my neutral pointer?

[Angrboda]

The concept of immateriality actually traces back to the problem of universals, realism versus nominalism, and the ontological status of things like essences, numbers, categories, and ideas. In my experience, people who call themselves "materialists" are at root nominalists.

I feel like if you explained just a little bit more, I might understand what you are talking about..

Same here. I read the SEP entry on the problem of universals and I just get confused. Maybe this is a topic which deserves its own thread.