art marble

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artificial sky

A dome (usually hemispherical) illuminated by concealed light sources; used to illustrate and study daylighting techniques on architectural models placed near the center of the hemisphere.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
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That variety is starkest when comparing the collections of small machine- or handmade, playable marbles and the larger decorative glass art marbles of the contemporary movement.