The great Polish director Krzysztof Kieslowski’s trilogy, Three Colors: Blue, White, Red — inspired by the French flag’s three colors symbolizing liberty, equality, and fraternity — explores the concept that all humanity is one, and what could be maddeningly abstract is brought to life through painstakingly created, richly sensory scenes. In the deliberately paced ”Blue,” an intense Juliette Binoche frees herself from a life of deceit and grief after losing her family in a car accident. In the funnier, more energetic ”White,” a would-be loser seeks equilibrium through revenge after his insolent wife (Julie Delpy) dumps him. And in the most lucid of the trio, ”Red” (for which Kieslowski won directing and writing Oscar nods), a heartbroken model (Irene Jacob) befriends a retired judge who provides friendship and redemption. Among the best of the DVDs’ abundant special features are numerous interviews, a batch of Kieslowski’s student films, and mini-cinema lessons taught by the director, who died in 1996. This powerful trilogy has been brought to DVD with the careful perfection of the films themselves.