Relativity
You may have heard of the theory of relativity, presented by Einstein. Well, this isn't that. It's another one. It goes on so:
Imagine a universe completely empty and barren. There is nothing in this space, except for a ball. I tell you that ball is rolling. But how can you tell if this ball is rolling? It's the only thing in the universe, you've got nothing to measure it up against. If it is, in truth, rolling, or in motion, how would you know?
The fact is that you would not.
What this theory says, in its core, that nothing is anything unless compared to another object. This ball is big, you say? What's the definition of big? How can you know if this ball is big if there's nothing to compare it to? Even you, technically, are nonexistant in this scenario. So how would this ball be big, or be assigned any other value, unless in comparison?
Taking this theory further, you could say...
No person is wise, unless in comparison. No person is moronic, unless in comparison. No person is beautiful, unless in comparison. No person is ugly, unless in comparison. No person is any quality unless compared to another person.
And that is my take on relativity.