designed by architect lord norman foster with sculptor sir anthony caro and the engineering firm arupit was described as "a blade of light" that would cross the thames and create "an absolute statement of our capabilities at the beginning of the 21st century." approximately 80,000 people crossed the bridge in the opening days, many more than anticipated. early on, vibrations of the bridge were being detected by the visitors. the engineers planned for some natural movement, of course; the structure was designed for it. but the bridge began to wobble and sway, enough to concern public officials, so that they eventually closed it. >> thousands of londoners showed up to walk across this beautiful new footbridge, the millennium bridge, and you can think of those people as analogous to the pendulums. except can i say one thing that's different? >> absolutely. >> one thing that's going to be different is that these pendulums -- that is, these people -- aren't going to stabilize this bridge, this plank; in fact, they're going to destabilize it. i think the thing that's important in keeping in