Similarly a work of art vanishes from sight for a beholder who seeks in it nothing but the moving fate of John and Mary or Tristan and Isolde and adjusts his vision to this. Tristan's sorrows are sorrows and can evoke compassion only in so far as they are taken as real. But an object of art is artistic only in so far as it is not real. In order to enjoy Titian's portrait of Charles the Fifth on horseback we must forget that this is Charles the Fifth in person and see instead a portrait — that is, an image, a fiction. The portrayed person and his portrait are two entirely different things; we are interested in either one or the other. In the first case we "live" with Charles the Fifth, in the second we look at an object of art.

"The Dehumanization of Art" - The Dehumanization of Art and Ideas about the Novel (1925)