rope access inspection and construction firm Reel Group Americas on February 13, 2009. Design and technology The stadium was designed by the architectural firms of Hermes Reed Architects and Lockwood, Andrews and Newnam who were teamed to create the Houston Stadium Consultants (HSC). The architects of Populous (then HOK Sport) and the HSC worked together with engineers from Walter P Moore and Uni-Systems to design the stadium utilizing the principles of kinetic architecture. The facility offers a sense of transparency, with its fabric roof and expansive areas of glazing. At night, the building appears to glow from within. The extensive use of glass provides an open-air feel to the concourses, which are open to the field of play. NRG Stadium has over 7,000 club seats, 186 luxury suites, and multiple lounges and bars. The stadium can be configured to utilize a space for meetings, specialty functions, exhibits, and concerts. One of the most notable aspects of the design is the stadium's retractable, fabric roof. The roof mechanization consists of two large panels that split apart at the 50 yard line, lying over and above each end zone when fully retracted. 10 parallel, tri-chord trusses ride on two parallel rails, each supported by a large, -long super-truss. Roof operation is controlled in the stadium press box via computer, containing live images of the travel path of each roof panel; plus, furnishing live feedback from all roof components throughout the operation. The roof panels can be opened or closed in as little as 7 minutes, moving at a speed of up to -per-minute. One bleacher section behind the north end zone, called the "Bull Pen", is the designated fan section for the hometeam. The fans in the Bull Pen interact directly with the action on the field, helping to create and implement fan traditions, songs, chants, and other elements of the game-day experience for spectators all over the stadium. Fans in the Bull Pen are encouraged to stand throughout the game, sing, cheer, and otherwise support the team in an enthusiastic manner. In 2011, Reliant updated their logo and therefore had to update their signage all over the stadium. In December 2012, it was announced that, in order to help bring the Super Bowl back to Houston, the stadium's end zone displays would be replaced with the largest digital displays in any professional sports venue. The video screens were revealed August 16,