The shape of the building emerged from thermodynamic analysis, a study of side wind forces on site, the need to shed leaves yet collect water, and the enclosure requirements. The use of natural thermal ventilation generated the roof shape, as smooth airflow required a clean, crisp interior skin. There are no visible ridges, eaves, gutters, downpipes or skylights on the exterior. The continuous wall/roof shape dispenses with gutters, reducing maintenance and removing a major bush-fire hazard. Rainwater, freed from the blockage of leaves and branches, falls directly into rock gardens for natural filtering and collection.