Arcology is a termed coined by the Italian architect Paolo Soleri in 1959 to describe the concept of architecture and ecology working as an integral system. Arcology designs are fully 3-dimensional mega-structure cities which can (theoretically) achieve much greater efficiencies, and promote more social interaction than 2-dimensional cities, while using far less land and consuming fewer resources. Arcosanti, a futuristic self-sufficient community in the Arizonan desert was started in the 1970s and has been under construction ever since.