Aesthetics is the study of beauty.
It’s the study of emotional values, sentiment and taste and involves all fields of the arts; music, communication arts, painting, photography.

© Tash Jayasinghe
It involves focusing not just on what the propositional or informational content of a text is, but also how that material is represented or otherwise rendered.
The word is ancient Greek but the modern form of this field was inaugurated by Immanuel Kant in the 18th Century in his studies of critical and aesthetic judgement.