This house on the northwest side of Tucson is a real laboratory. It has rammed earth, adobe, and straw bale components all built around a central courtyard. Rainwater is collected from almost 5000 square feet of roof and flows to a 30,000 site-built cistern which provides all water needs (including potable water) for nine months of the year on average. It also has a complete photovoltaic system, gray water system, and solar hot water.