The site of this home sits on a bench overlooking a wildlife preserve with beaver dams along the river running down a valley floor. Directly across the river, mountains jut sharply skyward, rising one thousand feet, to a ridgeline contiguous with the mountains of the Sun Valley ski resort. The house on this lot is designed for simplicity and cost efficiencies, while embodying exciting geometries and focused on sustainable design practices. A light timber frame, wood, concrete, stone, and glass are the pallet of materials from which the completely passively conditioned house is constructed. It is sunken into the edge of the bench and bermed to the entry side for protection from the elements, privacy, and association with the preserve below.