An idea which is, in its expression, essentially an object of mental and emotional appreciation, and which is embodied in a tangible medium of expression, is possibly subject to copyright protection. Musical compositions, sound recordings, novels, poetry, paintings, and sculpture are all traditionally copyrightable expression. Copyrightable forms of expression in the realm of business include written instructions, advertising designs, promotional copy, computer display layouts, computer programs, game boards, dolls, graphical and sculptural forms which are conceptually separable from useful articles such as lamps, shoes, automobiles.