Short explanation--

Most are not aware there were actually THREE buildings that "collapsed" on 9/11 due to the mainstream media focus on the Twins. The two long lights in pic above represent, obviously, the Twin Towers. The "half" light represents Building 7 (which was demolished shortly after the twins), owned by lucky Larry Silverstein who collected millions on his fresh insurance policy, and coincidentally where the CIA had loads of important files which were destroyed (wink wink) after the demolition. Search "Lucky Larry Silverstein" and "BBC reporter building 7 before it collapsed" for more info