Leo Stein (1872-1947) was an influential art collector and critic. It has been Stein's ironic fate to be referred to as "Gertrude's brother," ironic as for many years he was her mentor and counsellor. The A-B-C of Aesthetics considers the field of aesthetics not from a theoretical and discursive angle, not as a matter of classification and conceptual method, but from a basis of practical experience. The author insists that the...