By Blake Brittain WASHINGTON (Reuters) -In lively arguments that touched on the meaning of art and referenced famous films, TV shows and paintings, U.S. Supreme Court justices on Wednesday grappled with a copyright dispute between a photographer and Andy Warhol’s estate over the acclaimed artist’s paintings of rock star Prince. The court heard about two hours of arguments in a case that could help map the boundaries for artistic works that draw upon other material. The Andy Warhol Foundation appealed a lower court’s ruling that his 1984 paintings – based on a 1981 photo of Prince that celebrit…