SPORTS GROUND Russian patent published in 1994 - IPC

FIELD: construction. SUBSTANCE: two-layer boarding is equipped with movable in vertical direction drive rods whose upper ends are connected with boarding that makes it possible to provide any shape of boarding surface by means of control system. In this case, for certain pay, performed through devices for payment, spectators and televiewers, from their control panels, may take part in process of changing form of boarding surface. In this case, time for spectator participation and area of ground section controlled by spectator may be paid. EFFECT: there arises possibility for establishment of novel trend in development of sports industry and show business with active participation of spectators in action on ground. 12 cl, 11 dwg