Barrier

A low fence that runs along the circus ring perimeter, with two entrances one opposite to the other and opposite to vorgang (the curtain that separates the ring from the backstage area). The height of barrier is set so that a four-year horse of medium height could move freely with its hind hooves on the circus ring when standing on the barrier with its forehooves (usually half a metre). The width of barrier must be sufficient for a horse to run on it at gentle trot (usually a third of a metre). Sitting on the barrier facing away from the circus ring is considered very bad luck.