Adrian Piper : space, time and reference, 1967-1970. Robert Simthson

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1991

A cube / Sol Lewitt ; photographed by Carol Huebner ; lighting consultant, Jon Tower

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1990

Pretend / Adrian Piper

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1990

Wall drawings & structures : the location of six geometric figures : variations of incomplete open cubes / Sol Lewitt

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[1974]

These questions and your answers are part of a work in progress by Hans Haacke at the John Weber Gallery, October 7 through 24, 1972

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[1972]