Mateo Sobode Chiqueno’s Ayoreo ancestors worshiped the sun, which they saw as a superior and generous being. But for him and his generation, the sun has primarily become a threat, turning deforested areas into dry, dusty plains—filmed here beautifully but ominously. Some Ayoreo still live in seclusion in the forests of the Chaco in Paraguay. But many more, among them Sobode Chi...