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':
Sacramental matter and form Sacramental matter and form According to St. Thomas Aquinas, the Sacraments may be described in terms of their matter and form. The idea seems to have been first proposed by William of Auxerre. Thus, for example, the "matter" for Baptism is water; the "matter" for the Eucharist is bread and wine. The "form" of a sacrament consists of the words by which the Sacrament is affected. Thus Saint Thomas held that the form of the sacrament of Penance was "I absolve thee." The Catechism of the Council of Trent states it this way: "Every Sacrament consists of two things, matter,