 The plaza could hold 20,000 spectators, with 9,000 in the stands and another 11,000 in standing areas.The stage, which was centered directly in front, was kept hidden by a metal curtain known as the Hoberman Arch, and flanked by two large 22 by video screens.The stage was decorated with a large 3D version of the Olympic logo, which held a second Olympic cauldron known as the Hero's Cauldron.