For "Comfortably Numb", while Waters sang his opening verse, Gilmour waited in darkness at the top of the wall, standing on a flight case on casters, held steady by a technician, both precariously balanced atop a hydraulic platform. On cue, bright blue and white lights would suddenly illuminate him. At the end of the concert, the wall collapsed, revealing the band. Along with the songs on the album, the tour featured an instrumental medley, "The Last Few Bricks", played before "Goodbye Cruel World" to allow the construction crew to complete the wall.