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Charlotte Posenenske, Series D Vierkantrohre (Square Tubes), 1967. Galvanized sheet steel, dimensions variable. Photo: Burkhard Brunn. [Black and white photograph of three, geometric metal structures sitting on a wide, outdoor concrete plaza. One of the metal structures is situated in the center of the photograph, while the additional two sit behind it, flanking it on either side. The structures are composed of hollow cube-like and triangular components.]