Designed to simulate excavated layers of the earth, the architectural concrete walls at Getty Villa are dimensionally precise and aesthetically diverse. The 64-acre site features rustic horizontal and vertical board-formed concrete made from random lengths of wood with variable widths and thicknesses; sandblasted, exposed aggregate concrete made with Type II and white cement; and seeded and integral decorative colored aggregates exposed by a variety of methods including grinding, sandblasting, retarding, and acid washing. Similarly, concrete slab finishes feature ground and polished concrete, seeded and exposed aggregate surfaces, and smooth, acid-washed surfaces.