Deriving from the Greek word aisthetikos, which deals with “sense perception”, the term aesthetics is now used in a variety of ways. When brought into English and other European languages in the nineteenth century, “aesthetic” was used to indicate the response to art and was especially concerned with beauty. Although still used in that way, the term “aesthetics” has also taken on the trappings of a philosophical system, often stated as the philosophy of beauty and good taste. A philosophical system is derived from a set of principles, thus a philosophy of aesthetics must be based on aesthetic principles.