structure" in the Boston area. Simmons Hall was featured in the exhibit Inside the Sponge—Students Take on MIT Simmons Hall at the Canadian Centre for Architecture in Montreal in the fall of 2006. On the other hand, the building has been criticized as being ugly, a sentiment echoed in James Kunstler's Eyesore of the Month catalog. As part of the MIT List Visual Arts Center's Percent-for-Art program, a piece was commissioned for the building by American artist Dan Graham. The sculpture, titled Yin Yang Pavilion, consists of a partially reflective, glass-walled, gravel-paved area in the shape of half of the yin-yang symbol in plan, while the other half contains a shallow pool of water. Former undergraduate dorms Some notable MIT undergraduate dorms have been closed down after an extensive operating history. Bexley Hall was demolished due to concerns about structural integrity. Senior House was disbanded, with the building converted to a graduate student residence, after administrative controversies. Bexley Hall Bexley Hall was a former MIT dormitory located at 46-52 Massachusetts Avenue. Bexley was an early twentieth century brick building, consisting of four four-story walkups surrounding a central courtyard. It was almost directly across the street from MIT's Building 7; old MIT official directories described it as being "just a stone's throw from the Institute's front door". As former apartments which were renovated in the 1970s, Bexley suites had full kitchens and bathrooms. The stout, soundproof walls of Bexley were extensively painted by students and were plastered with murals and graffiti, some of which dated back to the 1960s. Long known for its alternative culture, Bexley was among the first MIT dormitories to officially become coed, housing 120 undergrads. Some residents owned pet cats and allowed them to roam free around the building, decades before MIT officially adopted a cat-friendly policy in 2008. The May 1970 Grateful Dead concerts at MIT were sponsored by Bexley's housemaster. Following leads in the phone hacking case of Cap'n Crunch, the Federal Bureau of Investigation visited Bexley in the early 1970s. Twenty to thirty Bexley residents filled a living room and were "interviewed" by two FBI agents. "We shared popcorn, and asked them more questions than they asked us; the spirit was boisterous." On May 7, 2013, MIT announced that Bexley Hall would be closed for up to three years, due to significant water damage inside the building's exterior walls that rendered the dormitory unsafe