Suppose I wanted to start a new shoemaking company. What's stopping me from offering the U last, 888 last, 348 last and the Trubalance last in my new line of shoes? I can easily copy the lasts from extant wooden lasts from the appropriate workshops or, in the worst case scenario, simply make a plaster cast of an existing shoe. So, why do we pay so much attention to which maker uses what last? In theory, any maker can easily duplicate any last. What are the analogues to other forms of intellectual property in music, software and film? Discuss.