Plan of Babel Canyon Arcology city structure design by Paolo Soleri, from 1970 exhibit at Corcoran Gallery of Art, Washington, DC

Photograph of inscriptions on a retaining wall at Cosanti in Paradise Valley, Arizona

Photograph of inscriptions on a retaining wall at Cosanti in Paradise Valley, Arizona

Photograph of inscriptions on a retaining wall at Cosanti in Paradise Valley, Arizona

Model of Arcube city structure Arcology design by Paolo Soleri, from 1970 exhibition at Corcoran Gallery of Art, Washington, DC

Model of Arcosanti Arcology city structure design by Paolo Soleri, from 1970 exhibit at Corcoran Gallery of Art, Washington, DC

Model of Arcosanti Arcology city structure design by Paolo Soleri, from 1970 exhibit at Corcoran Gallery of Art, Washington, DC

Plan of Babel IIB Arcology city structure design by Paolo Soleri, from 1970 exhibit at Corcoran Gallery of Art, Washington, DC

Model of Arcvillage II farm town Arcology design by Paolo Soleri, from 1970 exhibit at Corcoran Gallery of Art, Washington, DC

Model of Hexahedron Arcology city structure design by Paolo Soleri, from 1970 exhibition at Corcoran Gallery of Art, Washington, DC