Arizona architecture

One of the vaults, or covered work areas.

Ceramics apprentice Duncan Halleck, right, works on casting techniques.

An artistic shade provider stands along side a hiking trail at Arcosanti.

The Apse, where ceramics work is conducted.

The interior of the Apse.

One of the simple but comfortable guest rooms.

The ceiling of one of the guest rooms.

Housing units on the edge of an outdoor amphitheater.

Biosphere 2 was an attempt at living in a closed ecological system. Visitors leave one of the domes after a tour.

Biosphere 2 has become a science research facility in Oracle, Ariz.