The following image has been taken inside the Valve headquarters by TF2 community member "Political Gamer".
Speculation time.
Source: http://www.gamedaily.com/games/portal-2/playstation-3/game-features/valves-offices-reveal-some-odd-looking-concept-artwork/
Speculation time.
Source: http://www.gamedaily.com/games/portal-2/playstation-3/game-features/valves-offices-reveal-some-odd-looking-concept-artwork/