A rendering of the Kaleidoscope at the Hub and Hub Tower from Feb. 27, 1984. Hubbell Realty

The Kaleidoscope at the Hub project at 7th and Walnut streets in downtown Des Moines under construction on Aug. 17, 1984. The Des Moines Register

The towers and the wide skywalk at the Kaleidoscope at the Hub wearing a heavy coating of the season's first snowfall on Dec. 8, 1985. The Des Moines Register

Snow marks the flat, wide roofs of the convention center nearing completion in downtown Des Moines along 5th Avenue and Grand Avenue and Keosauqua Way. The Des Moines Register

Workers install anchors for railings on balconies stacked on the side of the new Kaleidoscope at the Hub tower under construction in downtown Des Moines on July 6, 1985. The Des Moines Register

Work progresses on grou

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