aesthetic

The noun aesthetic is often found used in its plural form. In the plural form, aesthetics can refer to the theory of art and beauty—and in particular the question of what makes something beautiful or interesting to regard:

Although he could extemporize animatedly about the history of the valve seat grinder, or the art of ropemaking, or how long it took to manually drill blast holes into a deposit of coal, aesthetics were another matter. The unlikely beauty of his rusty treasures defied elaboration.
Donovan Hohn, Harper’s, January 2005

This sense is sometimes encountered in constructions that treat it as singular:

With the removal of the studio packages, those cinema owners still providing double features began exploring less arbitrary and more justified pairings of films. The double feature became a special element of movie houses concentrating on the presentation of classic and art films. And this is where an aesthetics of the double feature emerges.
Chadwick Jenkins, PopMatters, 16 Aug. 2016

So Sontag was wrong to describe camp as an "unserious, 'aesthete's' vision." Aesthetics is always serious when agreed-upon interpretations are changed or stolen or emptied out.
Dave Hickey, Harper's, December 2009

A word that follows a similar pattern is poetics, (which also happens to be the title of a work by Aristotle focusing on literary theory and discourse):

A poetics of film, he has argued, seeks to reveal the conventions that films use to achieve their effects-and cognitive explanations provide insight into how and why filmic conventions, like shot-reverse-shot or empathy close-ups, produce the effects they do.
Alissa Quart, Lingua Franca, March 2000

As a plural noun, aesthetics can also be used as a synonym for beauty:

For reasons of economy and aesthetics, though, most of the house was stick built and is perfectly cozy without any elaborate beam work.
Andrew Vietze, Down East, May 2003