4k BALLS OFF THE TABLE.
It is a foul if a ball leaves the playing surface, does not return by its own means and remains off the playing surface (other than when potted).
Balls are returned to the table as follows...
(a) If a cue ball, it is played from baulk.
(b) Object balls are re-spotted.
If a ball returns to the table by its own means then...
(a) It is not a foul if a ball leaves the playing surface runs along a cushion and drops back onto the surface before coming to rest or falling into a pocket, provided other requirements of a legal shot are fulfilled.
(b) It is a foul if a ball leaves the playing surface and contacts a person, or an object that is not part of the table (such as a block of chalk) and then returns to the surface.