A system comprising detector circuitry configured to detect the occurrence of the predetermined event associated with the sport; a plurality of electronic display elements; and a sporting display device comprising circuitry (201, 202) configured to control the plurality of electronic display elements to display one or more electronic images in response to a detection by the detector circuitry of an occurrence of a predetermined event associated with a sport, the plurality of electronic display elements being attachable to a sports net associated with the sport in a configuration such that the one or more electronic images are displayed on the sports net, wherein: the predetermined event comprises an object associated with the sport crossing a boundary defined for the sport; the one or more electronic images indicate that the boundary has been crossed by the object; the boundary defines an area within which the object must remain according to a rule of the sport and the predetermined event comprises the object leaving the area defined by the boundary; and the one or more electronic images indicate that the object has left the area defined by the boundary; wherein the position of the object relative to the boundary is determined by the detector circuitry based on one or more captured images of the object and the boundary, the predetermined event comprises an object associated with the sport contacting a sports net; and the one or more electronic images indicate that the object has contacted the sports net and wherein the velocity of the object relative to the sports net is determined by the detector circuitry based on one or more of the captured images of the object and the sports net and the electronic images display a ripple whose intensity is determined in accordance with the velocity of the object. detector circuitry configured to detect the occurrence of the predetermined event associated with the sport; a plurality of electronic display elements; and a sporting display device comprising circuitry (201, 202) configured to control the plurality of electronic display elements to display one or more electronic images in response to a detection by the detector circuitry of an occurrence of a predetermined event associated with a sport, the plurality of electronic display elements being attachable to a sports net associated with the sport in a configuration such that the one or more electronic images are displayed on the sports net, wherein: the predetermined event comprises an object associated with the sport crossing a boundary defined for the sport; the one or more electronic images indicate that the boundary has been crossed by the object; the boundary defines an area within which the object must remain according to a rule of the sport and the predetermined event comprises the object leaving the area defined by the boundary; and the one or more electronic images indicate that the object has left the area defined by the boundary; the predetermined event comprises an object associated with the sport crossing a boundary defined for the sport; the one or more electronic images indicate that the boundary has been crossed by the object; the boundary defines an area within which the object must remain according to a rule of the sport and the predetermined event comprises the object leaving the area defined by the boundary; and the one or more electronic images indicate that the object has left the area defined by the boundary; wherein the position of the object relative to the boundary is determined by the detector circuitry based on one or more captured images of the object and the boundary, the predetermined event comprises an object associated with the sport contacting a sports net; and the one or more electronic images indicate that the object has contacted the sports net and wherein the velocity of the object relative to the sports net is determined by the detector circuitry based on one or more of the captured images of the object and the sports net and the electronic images display a ripple whose intensity is determined in accordance with the velocity of the object.