Bihari man in white turban and dhoti, making clay oven in the ground to cook his meal at Sonepur Cattle Fair, Bihar, India, Asia

Berber troglodyte structures, Matmata, Tataouine region, southern Tunisia

Man in white vest and dhoti, pouring molten bronze into clay mould, in Chola style lost wax bronze casting workshop, Thanjavur, Tamil Nadu, India, Asia

Gray clay flats below Anvil Hill west of Hamilili Point in Petrified Forest National Park, Arizona, United States of America, North America

A small hill of gray bentonite clay that appears to be melting into the purple bentonite of Hamilili Valley on the south end of Petrified Forest National Park, Arizona, United States of America, North America

Baked white clay creates surreal pathway in the desert near the infamous Skeleton Coast, Namibia, Africa

Baked white clay creates surreal pathway in the desert near the infamous Skeleton Coast, Namibia, Africa

A small hill of gray bentonite clay that appears to be melting into the purple bentonite of Hamilili Valley on the south end of Petrified Forest National Park, Arizona, United States of America, North America

Aerial view of China Clay pits in Cornwall. Uk England

Aerial view of China Clay pits in Cornwall. Uk England

Aerial view of China Clay pits in Cornwall. Uk England

Aerial view of China Clay pits in Cornwall. Uk England

Aerial view of China Clay pits in Cornwall. Uk England

Aerial view of China Clay pits in Cornwall. Uk England

Aerial view of China Clay pits in Cornwall. Uk England

Aerial view of China Clay pits in Cornwall. Uk England

organic cosmetics. White clay.

organic cosmetics. Red, green and white clay.

Decoration of a clay pot with ornaments, manufacture of pottery, Bamessing, Cameroon, Africa

Male clay figure, manufacture of pottery, Bamessing, Cameroon, Africa

Decoration of a clay pot with ornaments, manufacture of pottery, Bamessing, Cameroon, Africa

Male clay head, manufacture of pottery, Bamessing, Cameroon, Africa

Man decorating a clay pot with ornaments, manufacture of pottery, Bamessing, Cameroon, Africa

Renovated touareg house in the historc center of Ghadames, Ghadamis, Libya, Unesco world heritage site

Clay jug on white battlements against a light blue sky, Asilah, northern Morocco, Tangier-Tetouan-Al Hoceima region, Morocco, Africa

Renovated quarter in the oasis of Ghadames, UNESCO world heritage, Libya

Windtower in historic adobe oldtown of Nain, Isfahan, Esfahan, Iran, Persia, Asia

Angel figurine made of clay on mossy stones

Azulejos, Funchal, Madeira Island, Portugal, Europe

Azulejos, Funchal, Madeira Island, Portugal, Europe

Giovanni Monchiero and his dog search for white and black truffles in Roddi, Piedmont, Italy.

Orvieto, Umbria, Italy, during a late spring sunset. Orvieto is noted for its Gothic cathedral, or duomo. The church is striped in white travertine and greenish-black basalt in narrow bands; its design has often been attributed to Arnolfo di Cambio, but the prevailing modern opinion is that its master mason was an obscure monk named Fra' Bevignate from Perugia; construction began in 1290.

Black truffle found in the ground in Roddi, Piedmont, Italy.

Vendemmia, harvest, of white Cortese grapes at La Scolca Winery in Gavi, Piedmont, Italy.

The prized white truffle (tartuffo bianco) in Cuneo, Piedmont, Italy.

Deadvlei, a white clay pan surrounded by the highest sand dunes in the world, Namib Desert; Namibia