Two Monsters Award-winning author by David McKee (author) (UK edition)

Two monsters live on either side of a mountain. Sometimes they talk through the hole in the mountain, but they never see each other. One evening, they get into a silly argument about whether day is departing or night is arriving, which escalates into a rock throwing fight, which eventually destroys the mountain, and enables the monsters to see each other’s point of view and live together as friends.