Measure the space between the two walls where you wish to divide the room. Add 10 inches to this number. Cut a piece of high-tension airplane wire to the length of the measurement and set aside.
Drill a pilot hole into the wall approximately 1 inch below the ceiling at the point where you want the room divider. Screw one eyehook into place in the pilot hole.
Hold a laser level up to the eyehook so it goes directly across the room, hitting the opposite wall. Have an assistant mark this spot with a pencil. Repeat the drilling and eyehook installation at this marked spot.
Thread the high-tension airplane wire through one of the eyehooks. Fold it over 5 inches onto the long section of wire and secure them together with wire rope clips. Repeat this process in the other eyehook, pulling the wire as tight as possible.
Install a row of curtain clips across the wire. Clip floor-to-ceiling curtains in place or use a large section of fabric. Pull the curtains out to divide the room.