Comment by bawolff

Wikipedia defines it as: Art is a diverse range of cultural activity centered around works utilizing creative or imaginative talents, which are expected to evoke a worthwhile experience,[1] generally through an expression of emotional power, conceptual ideas, technical proficiency, or beauty.[2][3][4]

I like the "evoke a worthwhile experience" idea.

Transformation is a bit ambigious imo. In a certain sense, every experience is at least a little transformative.