SFERA by the Italian sculptor Arnaldo Pomodoro – estimate SFr150,000-200,000 at Koller.

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SFERA is an 11in (27cm) diameter golden patinated bronze sphere with a polished exterior partly opened to reveal carved individual mechanical-like elements. The sculpture, which comes from a Swiss private collection, has the incised signature, title, date and number Arnaldo Pomodoro SFERA 1966 – 1/2 on the pleixiglass base.

Estimate SFr150,000-200,000.