Renegade architect Michael Reynolds and his green disciples have devoted their time to advancing the art of "Earthship Biotecture" – passive, solar, off-the-grid, sustainable housing. Earthship n. 1. passive solar home made of natural and recycled materials 2. thermal mass construction for temperature stabilization. 3. renewable energy & integrated water systems make the Earthship an off-grid home with little to no utility bills. Biotecture n. 1. the profession of designing buildings and environments with consideration for their sustainability. 2. A combination of biology and architecture.