Art car recent years the festival has been forced to limit the number of vehicles on the playa. As such they have restricted the vehicles that are licensed to what they are now calling "mutant vehicles". There has been some confusion within the Burning Man and Art Car communities over these two terms, with some believing the terms are simply synonyms. According to art car artist and Art Car Fest organizer Philo Northrup, art cars are "street-legal vehicles that have been permanently transformed into mobile sculptures". According to the Burning Man DMV ("Department of Mutant Vehicles"), Mutant Vehicles are "'art on wheels':
Gonzaga Cameo gained currency. To shore up the identification, it has been argued that the woman's head on the cameo is covered with a sort of bridal veil. J. J. Pollitt of Yale University believes that it is the Vienna cameo that represents Ptolemy and Arsinoe. As for the St. Petersburg cameo, Pollitt argues that the sharply defined quality of the "neoclassical" workmanship indicates a later date than is commonly recognized. He identifies the figures as Tiberius and Livia represented "in very generalized form so that they would simultaneously evoke the imagery of a Ptolemaic cameo and, through it, the imagery of