There is a secret room with art similar to those by Doug Rattmann in this chamber. There are two murals depicting AEGIS and Mel’s antique Portal Gun. Virgil also says that he has heard rumors about a creepy guy living in the service areas.
The music played during this chamber is called Welcome To The Future.
The second part of this chamber (Advanced Mode) can be seen in the menu screen after exiting a chapter 3 map.