Four decades ago in Iowa, schoolteacher Jane Elliott divided her nine-year-old pupils by eye color to teach them what discrimination feels like from the inside. This film recreates her exercise with thirty adult British volunteers of mixed ages and backgrounds, splitting them by eye color and handing one group arbitrary privileges while the other is systematically put down. Presenter Krishnan Guru-Murthy runs the exercise and asks the volunteers, on camera, how it feels to be told they are less capable because of something they cannot change. Psychologists Dominic Abrams and Funké Baffour watch from the sidelines, reading the group's shifting behavior as confidence collapses in the disadvantaged group and defensiveness or smugness rises in the other. The film does not soften the discomfort: arguments break out, some participants cry, others admit to feelings they did not expect to have. First broadcast on Channel 4, it treats Elliott's decades-old classroom experiment as a live test of whether prejudice can be manufactured in an afternoon, and how thin the line is between fairness and cruelty when someone else sets the rules.