"The contrast between the crowds and the joy of a U2 show and then this kind of silence the next day and family life slightly freaked me out. I hadn't yet figured out the psychology of this, that you empty yourself on stage so there is a hollowness that follows a big night like that."
- Bono on the 1987 Joshua Tree tour
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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.