Polgovsky’s stunning debut immerses the viewer in the impoverished lives of families in the arid desert region of San Luis Potosi in Mexico (situated on the global parallel known as Tropic of Cancer), who survive by selling plants and animals to motorists by the side of a thunderous superhighway leading to the United States. The film brings together handheld images of searing potency, crafting an up-close, near-wordless visual essay on the human capacity to adapt to the most adverse circumstances.