‘Who is Namatjira? Namatjira could be anybody’: Archibald winner Western Arrernte man Vincent Namatjira talks to Take It Blak host Rachael Hocking about growing up in foster care, learning about his famous Namatjira surname, and what it means to be the first Blackfulla to win the Archibald Prize, and build his own legacy as a contemporary figurative artist.