The Casting System is an Ecosystem that is financially supported by people looking to cast, well as the bg actors who are looking to be cast.
Even when cast, the ecosystem of bg is segmented by who is union versus nonunion.
Roles of people associated with BG actors fall into three categories of the On-Set life, the Class life, and the Life Maintenance sector.
Culture of BG is presented as being very simple "be there and be on time", however there is a complicated list of unspoken rules depending on place in the hierarchy within the BG community.
Adherence to these rules depends on their own self selected segmentation into levels of dedication.
The various ways in which the life of Background Acting is meaningful to it’s participants.