We shall have gained much for the science of æsthetics, when once we have perceived not only by logical inference, but by the immediate certainty of intuition, that the continuous development of art is bound up with the duplexity of the Apollonian and the Dionysian: in like manner as procreation is dependent on the duality of the sexes, involving perpetual conflicts with only periodically intervening reconciliations. These names we borrow from the Greeks, who disclose to the intelligent observer ...