a. descriptive aesthetics: it does not deal with the content of the message, only with its form and the relations between different elements of influence within the whole experience.
b. interpretive (evaluative) aesthetics: in relation to the content of the message, it interprets and evaluates the form of the message and the relation between the meaning and the elements of influence, within the whole experience.
It has three different approaches based on what kind of sensual forms it is ready to accept as ‘message’.
a. art philosophy (analyzes exclusively the intentional self expressions /compositions/)
b. general aesthetics (ready to analyze every man-made sensual form)
c. universal aesthetics (ready to analyze every sensual form, e.g. even the aesthetic examination of natural phenomena)
The questions and answers of aesthetics change significantly with time.