What's the societal purpose of design patents? I get the purpose of utility patents: tell us how you did it, and in exchange we promise not to compete with you for a while. Utility patents are an alternative to trade secrets. But with a design patent, what is society getting in exchange? Giving designers more of an incentive to produce original designs? Does originality suffer without it?
I guess now that copyright is going to cover furniture, the difference is that the term is ridiculously longer (effectively indefinite), but designers also have to prove that there was deliberate copying if they want to sue for infringement?