The motif of the stamp(s) is the mythological Tree of the World – an ancient Croatian myth about the structure of the universe. The ancient god Perun is lord of lightning and time. He often appeared in the form of a great eagle or hawk. He was an ancient god to whom all the birds, the stars, the sky and all the air belonged. Perun’s brother Veles is the lord of the underworld and water. He rules the world of the dead, spirits and darkness, but also three kinds of treasure.