The Lewis Center, which has attracted worldwide attention as a model of ecological design, operates according to environmental principles. It is powered entirely by solar energy, features landscaping with fruit trees and vegetable gardens, and houses a Living Machine, which processes all wastewater for reuse in the building or landscape. Orr puts the Lewis Center into historical design context and describes the obstacles and successes he encountered in obtaining funds and college approval, interweaving the particulars of the center with thoughts on the larger environmental and societal issues the building process illustrates.