Bono poiting to The Edge

"Our idea was really to have the audience be on the stage there with you, we learned that in the mid 80s. We've been trying to figure a way to do it outdoors since. There's a bit of sleight of hand involved because by moving all the gear up away from you and over you, you're just left with a little punk rock band there in the middle." - Bono on the 360 tour