Set design After producing the band's previous tour, Zoo TV, which featured a complex setup involving 36 different video screens, Williams did not want to produce another video-based show unless it was going to be completely different from its predecessor. His initial proposals to U2 featured physical designs, including a center stage surrounded by a racetrack with circling trucks and motorbikes. Fisher researched one of the first LED screens to be imported into the United States. (It was built for the State Fair of Texas in 1995). Fisher proposed to make a much larger LED screen by spacing the pixels further apart, thus creating a lower resolution image. A prototype was built with LED pixels placed 75 mm (3 in) apart on a cargo net. It worked successfully and served as a basis for the proposal of the design. The idea for producing another video-based tour gained much interest when Fisher and Williams were determined to create the largest video screen in existence at that time. When the idea for the screen was proposed to U2, they decided to take the risk of creating a show based on an undeveloped technological experiment, and invested US$7 million to develop the screen. Fisher proposed the idea of creating an LED screen on a flexible fabric sheet that could be draped over the stadium seats behind the stage. It was later decided that it would be easier to build the screen if it was hung in its own frame, so a sloped frame was added to the screen. Several months were spent experimenting with and demonstrating the capabilities of LED video. The screen designed for the show was ten times larger than all 36 Zoo TV screens put together, with a total size that ranged between 150 and 170 feet (46–52 metres) wide and 50–56 feet (15–17 metres) tall, approximately the same size as the backdrop used during the band's Lovetown Tour in 1989. The screen was created with the help of three separate companies, each of whom manufactured different components. The screen contained 150,000 pixels, each of which contained eight separate LEDs of various colors. The pixels were manufactured by SACO Technologies, a Montreal-based company, which specialized in manufacturing control systems and panels for nuclear and hydrogen power stations. U2 were SACO's first client, and prior to the PopMart Tour, the company had no experience with video technology. Each of the pixels