Philosopher R.G. Collingwood's aesthetics involves the following three points:
1. To express an emotion is to become conscious thereof.
2, Expression also individualises; on this point Collingwood is following Croce, although perhaps due to the wartime climate he didn't give Croce credit.
3. The mind of the artist is made lighter and easier by this act of expression. This seems to have something to do with the Aristotelian notion of catharsis, but there are obvious differences.