A 6-foot-square glass pane, hanging by only the bottom edge from the 10th floor of the First Interstate Bank building (left), is secured by Nathan Groves (in the hat) and Danny Gallegos, both employees of a glass company. The two men made a cradle for the glass (bottom left) and then carefully lowered it to the ground. The two survey their work (right) after the broken glass was lowered over a ledge and to the street below. Dan McGrew, building engineer, said pigeons or building stress may have caused the 300-pound pane to shatter around the edges Saturday morning and then hang by its bottom silicon seal. Salt Lake police closed Second South from Main Street to West Temple for several hours to prevent the possibility of anyone being struck by the glass, which swayed with each gust of wind.