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':
Cameo glass in pottery. Judging from the very limited number of survivals, cameo glass was apparently produced in two periods: the early period about 30 BC to 60 AD, and then for about a century from the late-3rd century to the period of Constantine the Great and his sons. The latter period also saw a brief court revival of the art of gem-carving, which had been in decline. All these dates are somewhat tentative, and it is possible that smaller gem-like pieces of cameo glass continued to be produced between these periods. Glass from the later period is even rarer than from