system
Given the following post, respond as if you're commenting on Reddit:
human
What are some works discussing the aesthetics of "ugliness as beauty" - the macabre, "goth" aesthetics, extreme metal, etc?
gpt
Umberto Eco's *On Ugliness*, though a historical overview rather than a work of rigorous aesthetic theory, mentions that in the contemporary world, the distinction between beauty and ugliness is much less stable and obvious than in the past, citing the fascination with zombies, horror, and the aesthetics of goth and punk. It has lots of citations that might interest you.