This study is well-developed in theology, e.g. "water, greenery, and a beautiful face" were identified by Muhammad, founder and Prophet of Islam, as the key things that any person could differentiate from the background.
The word aesthetic can be used as a noun meaning 'that which appeals to the senses.' Someone's aesthetic has a lot to do with their artistic judgement. For example, an individual who wears flowered clothing, drives a flowered car, and paints their home with flowers has a particular aesthetic.
Some of the meaning of aesthetic as an adjective can be illuminated by comparing it to anaesthetic, which is by construction an antonym of aesthetic. If something is anaesthetic, it tends to dull the senses or cause sleepiness. In contrast, aesthetic may be thought of as anything that tends to enliven or invigorate or wake one up.
This illumination is imperfect in that anaesthetic is not an exact antonym of aesthetic. In common usage, anaesthetic refers to a dulling that is physical in its focus, while aesthetic is more commonly used to describe a mental or intellectual awakening or stimulation.