American, born 1928
Four-Sided Pyramid, first installation 1997,
concrete blocks and mortar, 458.15 x 1012.19 x 970.92 cm (180 3/8 x 398
1/2 x 382 1/4 in.)
National Gallery of Art, Gift of the Donald Fisher Family
Dennis Brack/Black Star
When is a cube not a cube?
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National Gallery of Art, Washington