Hania came to school very early. The corridor was quiet and smelled of chalk. Suddenly something rang in the "Lost" box. Hania lifted the lid and looked inside. Various objects were moving around inside. The sock spoke up first, in a soft voice. "I lost a pair, but that's not all." The ruler tapped and said: "Listen carefully." "The key is looking for someone to help." The backpacker yawned and confirmed with a short buzz. An old door handle beeped from the end of the corridor. "The door to music is sad today." A small golden key slid out of the box. "Hania, come with me, I know where I fit in." Hania squeezed the straps of her backpack and nodded. The corridor blinked with lights and grew long. There were chalk marks on the floor. The door handle sang: "Quick, quick, it's time!" "Someone's coming," the coat wardrobe beeped. Hania lifted the key over the lock and....