Create a home entertainment system using a giant screen in a room that does not have a blank wall.
Use a motorised drop down screen that covers the bookcase when in use and retracts out of sight when not required.
Notice that the front speakers (left/centre/right) are hidden within the bookcase and the screen is adjusted so as to allow the sound to transmit freely into the room. The rear flushmount speakers are recessed into the ceiling. Depending upon which way the beams in the ceiling run, it may be possible to actually mount the screen within the ceiling so that it lays flush with the surface of the ceiling. One button, remote automation makes using this system very user friendly.