When I first look at the circular structure, it reminds me of two things: science fiction and secrecy.<p>Science fiction because in many SF movie secret agency are often in some circular dish-like structure. Imagine yourself walking from room to room, from lab to lab, when you open the door in one of the room you are on a staircase looking at hundreds of scientists and agents contacting an alien out there.<p>Secrecy because of the above and plus it reminds me of Pentagon.<p>Not a bad thing, but definitely a cool place.<p>Compare this to other HQs? Take Googleplex. Over time I find that campus a little more corporate. Maybe because it now houses so many people, plus a lot of the buildings are build like an ordinary office building.<p>I want to see the interior though.<p>One thing important to all HQ: lobby is one of the most crucial things. To me it has to open, wide, clean and crazy - that;s where actions should happen.