"The last 24 hours were just extraordinairy. It was like Chinese calligraphy, where the monks take ages to mix the ink and then - bam! - it all happens in seconds."
- Bono on the making of the No Line On The Horizon album, 2009
The song Heartland is about a trip Bono and Adam made after the Joshua Tree tour through America by car, they passed many placed and states and Heartland contains phrases of Bono's journey of that trip.