Although the process has become more complex with the advent of composite materials (such as carbon fiber and Kevlar fabrics), clay modeling prototypes have changed little since the early ’30s when Harley Earl (a head of GM design), had a brainstorm while playing with a piece of clay he pulled out of a river bed. Earl contacted Chavant, a manufacturer of modeling clays, and a new automotive design method was born. Today, Chavant remains the industry standard in automotive clay modeling. Clay’s non-drying nature makes it perfect for design, since sections of a vehicle may go through many changes before a final look is decided on. At room temperature the clay remains firm; but with the application of heat, the clay returns to a more malleable state. Scraps can simply be warmed and reformed into blocks for reuse—a boon to designers who don’t have the deep pockets major manufacturers do.