These geometric forms present one of the biggest unsolved mysteries in pre-historic exploration.

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Mr. Cooper says a key to his practice is using repetitive geometric forms to enhance acoustics and disguise obtrusive elements.

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The shells are etched with simple geometric forms that are still used by Kalahari tribesmen to mark ownership of the shells, which they employ as water vessels.

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That ghostly union also emerges in work by the artists and groups associated with the international trend Nouvelle Tendance, who emphasized the collective and impersonal, favoring high-tech materials, geometric forms, light, movement and an active engagement with the viewer.

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Some days, the menu is a kooky graphic collage, and until recently the bathroom was a neon-fluorescent hall of triangular mirrors. (Perhaps in response to quizzical attention, it has been toned down.) Geometric forms abound, the furniture looks vaguely Scandinavian woodsy yet sleek and the over-all feeling is that of a hippie ski cabin.

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Art Deco's simplified, streamlined forms, thrusting vertical elements and geometric ornamentation captured the spirit of a rising city determined to secure its place in the modern world.

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In the Nasrid Palaces, a palace complex within the palace complex, the combination of building materials (wood, stone, ceramics and plaster) with traditional Islamic forms (intricate calligraphy, stuccoed ceilings and interwoven geometric patterns) reaches a point close to perfection.

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