The court at Plum Orchard was fully restored in 2008 with the tins in place and working electric lights. It was added to George Lauder Carnegie's "Plum Orchard" estate on Cumberland Island, Georgia, in the winter of 1903/04, and is now owned by the National Park Service. An exhibit on squash tennis history has recently been installed in the mansion, which is occasionally open for public tours. Required equipment is fairly simple and inexpensive: junior tennis racquets and standard lawn tennis ball. In decades past, modified tennis balls were manufactured for the game. They had higher pressure and were slightly smaller than tennis balls. The last specially manufactured ball was green, so that it could be more easily seen against white walls. Early courts had dark wood walls so that white tennis balls could be seen. Players now either use a marker to darken a yellow ball, or use colored tennis balls (such as the pink ball sold on a limited basis by Penn to raise money for breast cancer research). Blue painter's tape can be used to add the additional lines on the floor and back wall of squash racquets courts. Squash tennis is played by two players. An illustrated playing guide with rules was published by the NSTA in 1968 (see external links below). At the beginning of the first game, a spin of the racquet is used to decide who serves first. In subsequent games of a match, the player who won the previous game serves first. The server stands behind the floor service line, either to the left or right of the center line. Tossing the ball in the air, he strikes it with the racquet before the ball hits the ground. The service is good if the ball:  This is the major difference between squash tennis and squash racquets. In the latter sport the ball must go beyond the floor service line into the receiver's box. But it is similar to lawn tennis, as the ball is served diagonally and lands in front of the service line. In squash racquets the server also stands in toward the side wall, rather than in the center of the court. At the beginning, the server can choose which side he starts, left or right. One fault is allowed if the ball does not go out (i.e. does not hit or go above the out lines, strikes the telltale, nor hits the floor before hitting the front wall). If the server wins the point he must then switch to the opposite side of the court (left or right) before serving again, alternating each serve.