Video screens that tower over the field use 36 million LEDs to display more than 25,000 square feet of imagery. The boards are 60 yards long, project figures up to 70 feet tall and were a source of controversy. After the video screens, which loom 90 feet above the field, were struck by punted balls during the exhibition season, the NFL decreed a special do-over rule: If it happens during a game, the play is ruled dead and the down replayed. (Tony Gutierrez / Associated Press)
The Cowboys and the San Francisco 49ers play an exhibition game under the retractable roof. (Ronald Martinez / Getty Images)
