U2 have never been a band noted for their love of shy understatement, but even by their standards, their arrival in Las Vegas represents a hitherto-unimagined degree of grandiosity. The interior of the concert hall is completely covered in LED screens, too. They stretch out far above the band and over the audience’s heads, the better to provide a sequence of genuinely astonishing visual effects. During The Fly, the visuals appear to descend from the roof of the auditorium, creating a fake ceiling made of pulsing numbers. Or, indeed, the fact that U2 are, in effect, playing against type.