(1844?1926).]]Art refers to a diverse range of human activities and artifacts, and may be used to cover all or any of the arts, including music, literature and other forms. It is most often used to refer specifically to the visual arts, including mediums such as painting, sculpture, and printmaking. However it can also be applied to forms of art that stimulate the other senses, such as music, an auditory art. Aesthetics is the branch of philosophy which considers art. Visual art is defined as the arrangement of colors, forms, or other elements "in a manner that affects the sense of beauty, specifically the production of the beautiful in a graphic or plastic medium".[LINK: http://www.bartleby.com/61/9/A0440900.html] The American Heritage Dictionary:Fourth Edition The nature of art has been described by Richard Wollheim as "one of the most elusive of the traditional problems of human culture".Richard Wollheim, Art an