Theatre of the Sphere is Luis Valdez's exploration of the principles that underlie his innovations as a playwright, teacher, and theatrical innovator. He discusses the unique aesthetic, more than five decades in the making, that defines the work of his group El Teatro Campesino--from shows staged on the backs of flatbed trucks by the participants in the Delano Grape Strike of the 1960s to international megahits like Zoot Suit. Opening...