To trigger this glitch, position yourself (when in monitor mode) along the lower ceiling, and face straight ahead so that your line of sight is more or less parallel to the lowered ceiling. Go to the scenery menu and select an item (note that some items will not work with this glitch). If done correctly, the spawned item should appear in the center of the map closest to the side the player is on. The player who forges the item will be unable to see it unless he exits the game and then views it in theater mode. However, this works much more effectively if there is another player working as a spectator. Letting go of the object will remove this effect, and sometimes launch the item a short distance across the map.