Unlike the buildings, whose material palette is limited to marble, aluminum, glass and steel, the Central Garden uses a multitude of materials, both natural and built, including grass, water, stone, trees, plants, flowers, cor-ten steel, and rebar, imaginatively used to create arbors, as seen at left. The plant species range from hydrangeas and roses to the azaleas that float in the pool that terminates the visual axis (the axis is also symbolic as the water starts as rain and moves down a stream to the pool). All the different plant and flower varieties help to create patches of color that come to life against the mute backdrops of the buildings. Nurtured by southern California's year-round warm climate, the changes between season are subtle, yet apparent. Each aspect of the gardens furthers the Getty Center's sense of being an oasis from the outside world, which comes at a price as 24 full-time people maintain the landscape, four alone for the Central Garden. Getty Center Garden.Los Angeles, California