"The Philosophy of Fine Art, volume 4 (of 4)" by Georg Wilhelm Friedrich Hegel is a compilation of lecture notes from courses given between 1818 and 1829. Hegel presents art as a mode of absolute spirit, tracing its development through symbolic, classical, and romantic stages. He examines five major arts—architecture, sculpture, painting, music, and poetry—in ascending order of inwardness. This influential work explores art's historical dissolution and its place as truth made sensible, shaping aesthetic theory for generations of philosophers and thinkers.
Wikipedia page about this book: en.wikipedia.org/wiki/Lectures_on_Aesthetics