The philosophy of art is distinguished from the wider topic of aesthetics only by confining attention to the aesthetic appreciation of deliberately produced works of art. A central problem is therefore that of defining what feature distinguishes such works from works of entertainment, craft works, things produced for other purposes, things in nature, or for that matter random effusions billed as instances of ‘self expression’. Although thus demarcating art proper may seem to be a pointless quest, the category retains great moral and political importance, for instance in distinguishing erotica from pornography. Other problems surround the relation between art and truth, and also that between art and morality. There are philosophical difficulties as well about the difference between a work of art and a forgery, the nature of aesthetic response and its relation to imagination, the general difficulty of describing the importance of art in life, and the nature of the emotional response appropriate to different works of art.