Ugliness Defines Beauty

In the the fall semester of 2022 I took a class called HON 380: Aesthetics and Society. The question was posed: "What is beauty?" It was there I began to ponder the abstract nature of the concept of beauty. There were several different compelling theories, beauty is defined philosophically, by evolutionary principles, or by societal and cultural norms. However, I still believed that these theories didn't do enough to full satisfy the question of "What is beauty?" The different theories all neglected to talk about an integral part of beauty and what I found to be the key to defining it, it's antithesis: Ugliness.