For nearly two centuries, scholars have been arguing that beige and white were not the true colors of antiquity. The Parthenon in Athens and the Forum in Rome might have been almost gaudy. Unfortunately, such ideas have never influenced Hollywood or many experts. For example, in "Gladiator," when Russell Crowe strides down the streets of ancient Rome, circa A.D. 180, he's backed up by the proper complement of white marble. In almost every view of the past, textbooks included, the ancient world comes off as monochrome.