This article is from the Table Tennis (Ping Pong) FAQ, by ttennis@bu.edu with numerous contributions by others.
Barriers are of great benefit at tournaments. When properly used, they
help prevent balls from entering other courts, keep the spectators at a
proper distance, speed up play by reducing interference, and make the
tournament more enjoyable for the players.
A suitable barrier is a large roll of single-faced corrugated paper that
can be snaked around the courts. Barriers should be between 30" and 36"
high and a dark or deep pastel color.
 
Continue to: