Whenever Mr. Spock left the bridge of the Starship Enterprise, the pocket door hissed open automatically and disappeared into the wall. You probably won't be asked to install this kind of high-tech hardware anytime soon, but there are a few tricks to hanging plain old hand-operated pocket doors that will keep your installations efficient and trouble-free. Why Use a Pocket Door? Pocket doors save floor space because the wall area to one side of the opening doesn't need to be kept clear to make room for the swing of the door. This makes them useful in entries, laundries, or other rooms where the door remains open most of the time. They are also a practical solution for tight spaces, like the