Films made by, for, and about indigenous and aboriginal peoples in various parts of the world. Among the earliest known indigenous films are those made by Navajo people as part of an experiment in indigenous image production conducted in the 1960s by US visual anthropologists Sol Worth and John Adair in an attempt at understanding ‘native’ ways of seeing the world (see ethnographic film). Indigenous peoples across the Americas soon became actively involved in self-representation through film and video production. In 1969, the National Film Board of Canada (NFB) started producing films by native people as part of its ‘Challenge for Change’ training programme for indigenous filmmakers. Since the late 1960s in Brazil, Bolivia, Colombia, and elsewhere in Latin America, documentary and political filmmaking has included work with and by native communities, often through the activities of grassroots video collectives (see politics and film).