Dennis Oppenheim (1938-2011)

Annual Rings, 1968

U.S.A./Canada boundary at Fort Kent, Maine and Clair, New Brunswick.

150' x 200'

Impersonation Station, 1988

Olympic Park, Seoul, Korea

26' H x 60' W x 60' D

Splash Buildings, 2009

Installation with seven elements

Heights 3 feet to 16 feet

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Donald Judd

Untitled, 1977 
Münster, Germany

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Carl Andre

Field Sculpture, 1977

53' at its base and 290' from apex to base

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Robert Morris

Observatorium (Observatory, 1971–1977)

Circumference of 91 m