Secret Rooms

I wonder if my future wife will let us have a secret door in our house. I really want one... This would be a throwback to my childhood days of drawing "super secret" houses with tons of hidden passageways and tunnels. The question is what to hide behind the secret door... Via this post from Engadget. Update: In addition, I would like to have this lighting... Shouldn't be too hard to do-it-yourself something similar...