Everyone involved with the "vanishing" retractable skylight over the 470-ft-long retail concourse of Salt Lake City's City Creek development pats structural engineer Jon D. Magnusson on the back. He was the one who dreamed up the idea that would end a stalemate between the mall's developers—the Church of Jesus Christ of Latter-Day Saints and the Taubman Co.—over an open-air mall or a covered mall (see p. 18).