Portuguese Pavilion, Expo 1998, Lisbon. Architect, Alvaro Siza. Two powerful, 15-metre high columns support the no more than 20-centimetre thick concrete ceiling which is reinforced by stainless steel cables set in the walls hanging overhead like a great sail. Photo: Quintin Lake

Portuguese Pavilion, Expo 1998, Lisbon. Architect, Alvaro Siza. Photo: Quintin Lake

Glazed tiles on the Portuguese Pavilion, Expo 1998, Lisbon. Architect, Alvaro Siza. Photo: Quintin Lake

The Pavilion of Portugal in Expo 1998 designed by Portuguese architect Alvaro Siza with the contribution of Eduardo Souto de Moura makes reinforced concrete seem weightless with the building’s elegant sail-like roof.

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Photography  © Quintin Lake, 2011