They used to pay "ball game", which was some kind of soccer-basketball kind of thing, and those rings were the "goals". There were 2 rings on each side of the field, players dribbled the ball using their feet and when they reached some distance near the opposite ring, they used their hip bones to make the leather-stone-hard ball go through the ring, scoring one point, the winning team was the one who scored more points or the one without broken hips. Yes!!