Art: Push & Pull

"Nature," says Buckminster Fuller, "always builds the most economic structures." With his geodesic dome now in wide use (e.g., at the U.S. exhibition in Moscow last summer), Bucky Fuller has delved into the geometry that underlies nature's structures from the atom to the planetary system, to produce two more pioneering ideas. Last week they were on view in the floodlighted garden of Manhattan's Museum of Modern Art.

One is a cantilevered truss made up of tetrahedrons (four-sided pyramids) and octahedrons (eight-sided figures), which looks like something made by a giant playing with an Erector set. Made of lightweight aluminum tubes, the "octet"...

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