"There's this image of the 'overground'. It was a time when everyone was all indie and grey and dull—the 'underground'. The overground was like coming out into the bright light of a modern city. It's an amazing place to be, walking around these modern cities like Houston or Tokyo. And the idea was coming out into that, embracing it, going after it."
- Bono about Zooropa
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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.