A large circular projection panel dubbed "Mr Screen" first made an appearance during performances of "Dark Side of the Moon" in 1974 and became a staple thereafter. The high quality, extreme wide angle projection required special high-speed, 35mm, 10,000 watt xenon film projectors, with custom lenses, all designed, built and toured by "Associates & Ferren". Specially recorded films and animations were projected onto it, and for 1977 "In the Flesh" and 1980–1981 "The Wall Live" tours, coloured spotlights were fixed around the rim, an effect which reached its zenith with the dancing patterns of multi-coloured lights in the "A Momentary Lapse of Reason" and "Division Bell" tours. In the latter, the screen could be retracted behind the stage when not required, and was tilted horizontally with its peripheral lights focused onto the stage into a single spotlight during the final guitar solo in "Comfortably Numb".