Hidden Doors, Secret Rooms, and the Hardware that makes it possible! - Fine Homebuilding (Ohhhhh, for the secret reading nook!)
How To Build A Secret Passageway With The Hidden Door Hinge System ... LOVE hidden passageways!
Space-Saving Double-Swing Doors Pivot on Hidden Hinges
Hidden door Hinge System - Cabinet And Furniture Hinges - Amazon.com
175 Degree Concealed Hinge | HardwareSource.com
Tectus Hinge installation photo showing concealed TE540 Concealed hinge
Secret door - great for the rooms you dont want people to go into.. makes me think of scooby doo, but still awesome!
Flush-Mount Murphy Door Hardware Kit - Hardware For bedroom door at bottom of master stairs.
Hinges for knee wall bookcase hidden doors