Wind Intervals. 1973. Enameled and stainless steel. Each unit 11' x 3' x 3'. Installation, Roosevelt Island, NY, 1976-1986. Photo: 1986.

The units are in effect weather vanes, aligning to the wind. But note the middle unit, weighted in inverse to the first and third. Note also their slightly different alignments, minor differences in ease of movement: they respond differently in varying strengths of wind.