"We had to build that stage in six minutes. I was on radio-controlled earphones and microphone. One error and you're off air. It was terrifying but all you can see is my usual expression when I'm terrified - a big smirk. But it was a great moment. That whole tour, we kind of fell in love with America again and they fell in love with us."
- Bono on playing the Superbowl half-time show in 2011
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The Popmart stage design, which looked like a supermarket, appealed to Bono as a supermarket, with its myriad choices and temptations, could function as a metaphor for U2's songs, as they often deal with the struggle between desire and faith.