A Pixar short about a lost-and-found box and the unseen monster within.

Set in an alternate WWI reality where a senseless war rages on, two soldiers on opposite sides of the conflict play a joyful game of chess. A heroic carrier pigeon delivers the soldiers' chess moves over the battlefield as the fighting escalates. Neither soldier knows his opponent as the game and the war builds to its climatic final move. Whoever wins the game, one thing is for certain: there are no winners in war.