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General view of the main entry to the museum; [New addition made in 1992 by Gwathmey Siegel and Associates, Architects.] The spiral first appeared in Wright's work as a motor car ramp leading to a mountain-top planetarium overlook (1925; unexecuted) but did not appear again until the first designs for the Solomon R. Guggenheim Museum (1943), New York, resulting in the extraordinary (and functionally controversial) upwardly expanding helix of the main gallery (built 1956-1959). Source: Grove Art Online; http://www.groveart.com/ (accessed 2/8/2008)