Bollu Helmet

Blind Man’s Bollu Helmet is a two team sport using a ball and clubs. The practitioners wear a mask reminiscent of the plague doctors that obstructs the eyes, blinding the players. Based on listening stations used in the First World War, the masks use a form of sonar echo-location so that players can hear but not see the other players. The echo-location does not work very well and games tend to be violent.