You can see a better image of the leg below. It's just attached to the wall as a display leg. I believe they can pull it up when they expect bunch of people to be outside the control room like launch day, etc.
From that article:"Beaumont has built equipment as small as a phone booth..."I'll bet that there are readers here who have never seen a phone booth.
A remarkable look inside SpaceX's (then relatively new) factory in Hawthorne in Nov. 2008, about two months after the first successful Falcon 1 launch. Photos by Dave Bullock, then shooting for Wired.
Fresh coat in progress for the Hawthorne monument.
Chinese New Year Celebration At SpaceX