On a long subway ride with his sister, a boy named Milo studies the people around them and imagines where they live and what their lives are like. A bearded man lives with many pets in a cluttered apartment. A woman in a fancy dress with a small dog is on her way to a wedding. A boy in a suit lives in a castle--until that same boy gets off the subway at the same stop as Milo, teaching him that you can't judge another person by the way they dress.