Set on a grassy hillside in Ouro Branco, Brazil, this 484-square-foot home that Gustavo Penna Architect and Associates designed for Gerdau, an international steel production company, is an exercise in artful reuse. "The house is built from the byproducts of mining," architect Gustavo Penna says. "It’s part of Gerdau’s environmental education program, which aims to create new concepts in sustainability."
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