On Beauty. What is it?

If you ask, “What is beauty” you are assuming that something exists which the concept “beauty” applies to. How do you know this? Why do you assume it? Can you ask whether your assumption is true without first having an understanding of what beauty is? Are you therefore not really asking, “When I use the word beauty, what do I mean?” And if that is the question you are asking, aren’t you avoiding the question of whether “beauty” exists? Is there any way out of this closed circle? Is it actually possible to ask, on its own terms, the question, “What is beauty?”