game relies heavily on the sense of hearing instead of sight, so all outside noise, including cheering, clapping, chanting or ringtones from cellphones, is prohibited. The crowd is therefore repeatedly reminded to remain silent, and referees preface their call "Play!" with "Quiet, please!". Coaches cannot speak whilst the ball is in play, and so cannot influence the game. Players, regardless of the degree of vision, wear blackened-out eyeshades which allow no light in, to ensure fairness. Fully-sighted individuals may play the sport while wearing eyeshades. Beginning of play The team winning the coin toss usually starts with the ball. Offence To score, a player must roll or bounce the ball down the length of the court, past the opposing defenders, and into the opponents' goal. Typically, the player with the ball will stand, orient themselves using the tactile lines, sounds from teammates, and/or the crossbar of their own goal. The player will then stride forward, lean low, and roll or side arm the ball down the court. The ball must hit in the player's own landing zone, and anywhere in the neutral zone. So long as it hits each zone, the style of throw is entirely up to the player in question. Many players will take several strides and release the ball as close to their own high ball line as possible; leaning low to ensure a legal throw. Some players will throw after spinning; transferring the momentum of the spin into additional velocity. Others are able to throw the ball so that it will bounce just once in each of the required zones. Most elite players are effective when using multiple types of throws. Defence The defending players stay within the team area, generally in somewhat staggered positions to avoid collisions. When they hear the other team throw the ball, they 'lay out', that is slide on their hips and stretch their arms above their heads and extend their legs in order to cover as much distance as possible. The objective is simply to keep the ball from getting past with whatever part of the body the player can get in front of it. Some players prefer to block the ball with their chests and absorb the impact. Others like to block with their legs so the ball will roll up their bodies into their hands. Regardless of method, the players will always try to make themselves as long