From the Ground Up: U2 360° Tour Official Photobook

For a number of years, U2 had been thinking about how to design a set that would create an 'in the round, 360-degree experience for outdoor shows' which would be spectacular but which would also be transportable enough to tour. In the summer of 2008 a small team was convened to try and make this a reality. This is the official, complete, inside story of U23600°, one of the greatest rock and roll stadium tours of all time.