The egg was an important symbol in the mythologies of many early civilizations. It was commonly believed that the universe developed from a great egg and that the halves of its shell corresponded to Heaven and earth. Many pre-Christian and Indo-European peoples, like Egyptians or Persians made a practice of colouring eggs in the spring as a fertility ritual.
Greeks mainly colour eggs red (scarlet) to signify the blood of Christ. They use hard-boiled eggs (painted red on Holy Thursday) which are baked into twisted sweet-bread loaves or distributed on Easter Sunday; people rap their eggs against their friends’ eggs and the owner of the last uncracked egg is considered lucky.