"We took over this little hotel, that they call a riad, and set up the gear in the courtyard. So it was open, a square of sky over our heads. You can hear the call to prayer, birds flying around. Two swallows came back regularly to shit on Larry's drums."
- Bono describes the album sessions in Fez, Morocco in the summer of 2007.
The song 'Numb' is about how The Edge felt when he split up with his wife. He felt like he couldn't do anything, he was useless. He felt numb.