"A State of Mind" offers a rare and often chilling glimpse into the culture of North Korea, the world's least visited country, which Nicholas D. Kristof recently described on the op-ed page of The New York Times as "the most bizarre . . . most regimented, militarized and oppressive country in the world." Directed by Daniel Gordon, a British sports journalist whose first film, "The Game of Their Lives," documented the performance of the North Korean soccer team in the 1966 World Cup competition. Dana Stevens reviews the film in the New York Times (free subscription required to view).