In the North American shows, a set of seven retractable, see-through LED-based lighted bead curtains hung behind and to the side of the stage, showing abstract patterns, maps, moving figures, and occasionally text. The curtain design permitted concertgoers around the arena to have an excellent view of the curtains above the band and the images they displayed. The roll-drop LED screens were designed by Fisher using 360deg golf-ball pixels developed with Frederic Opsomer of Innovative Designs in Belgium. The spherical LED product joined the BARCO product line as the Mi-Sphere. The Vertigo Tour used 189 strings of these "MiSphere" LED balls suspended from custom truss, which allows the LED curtains to be rolled up. High above the center stage hung the MiSphere strings, each containing 64 spheres and totaling nine meters long. Dynamic, "moving" lights were also embedded in the stage and the B-stage ramp, as well. Four screens suspended above the stage showed close-ups of each member of the band, another element reused from the Elevation Tour.