You didn't love physics at school, despite the fact that Nikola Tesla himself was your teacher. At recess, you came to the physics room before your classmates did; there was no one in the class but you and the teacher. While going about your business, you suddenly hear Tesla asked you, as luck would have it, the teacher was in the mood to talk to you

"Do you think universals can exist as essences of concrete things, or are they just creations of the mind?"