Oakland artist Boots Riley made a name for himself in the early ’90s with his group The Coup, singing about revolutionary politics, before taking an active role in the Occupy Oakland movement in recent years. Now, Riley ventures into new territory: a collaborative stage performance featuring musicians, dancers, actors and puppets called “The Coup’s Shadowbox,” inspired by a surrealist production he saw as a child. Riley talks about his latest production and taking his activism beyond music.