The eight-minute film “Man in a Maze” opens with an aerial view of fresh produce being dumped into a landfill at the Mexico-U.S. border, and ends with an aerial view of a community garden. In between, the documentary, which won the Sundance Short Film Challenge, covers the problems of malnutrition and hunger in the same region where the northward flow of winter-crop produce occasionally is diverted to landfills because of trade rules. Some of the dumped food goes to food banks. Gary Nabhan, founder of a project to save native plants and encourage local food production, is one of the people in the film who speaks about food as a form of empowerment. At one point, he describes local food as a way to “rebuild the food system from the bottom up in a participatory way.”