Four-Sided Pyramid
Encyclopedia
Four-Sided Pyramid is a conceptual
Conceptual art
Conceptual art is art in which the concept or idea involved in the work take precedence over traditional aesthetic and material concerns. Many of the works, sometimes called installations, of the artist Sol LeWitt may be constructed by anyone simply by following a set of written instructions...

 modular "structure", by Sol LeWitt
Sol LeWitt
Solomon "Sol" LeWitt was an American artist linked to various movements, including Conceptual art and Minimalism....

, in the National Gallery of Art Sculpture Garden
National Gallery of Art Sculpture Garden
The National Gallery of Art Sculpture Garden is the most recent addition to the National Gallery of Art in Washington, DC. Completed and opened to the public on May 23, 1999, the location provides an outdoor setting for exhibiting a number of pieces from the Museum's contemporary sculpture...

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The artist created a plan and Four-Sided Pyramid was constructed by others, in 1999.
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