The social and spiritual lives of the Lega people, are governed by a central initiation society known as Bwami; Bwami is responsible for teaching morality through community performances, dances and objects. The Bwami association includes 5 society grades including:
A Lega man must pass through all (voluntary) initiation societies respectively to be considered a rounded man with full insight into ancestral teachings and traditions. The Bwami association is also believed to strengthen bonds within the community.
Each initiation society has its own associated objects and sculptures (isengo, pl. masengo meaning 'heavy things') including the idimu ornament used by yananio and kindi initiates. Believed to represent the head of a lineage group or the founder of the highest Bwami level in the community, the idimu ornament is collectively owned by the grade group and kept by the oldest and most respected member of the grade. During major community performances, the idimu ornament is hung from a fence, surrounded by the smaller, personally owned lukwakongo ornaments.
NOTE: "Most Lega 'masks' are actually ornaments rarely worn over the face. They are instead attached to different parts of the body, piled in stacks, hung on fences, displayed, dragged on the ground and occasionally worn on the forehead with the beard draping over the face of the wearer. They are used to portray the importance of ancestors and are among the initiation objects displayed on the grave of deceased members."3