In Roman mythology Jupiter himself changed into a swan to seduce Leda. Helen of Troy and her brother Pollux were born later. It is a sacred animal to Apollo, as the god of music, attribute of the muses Erato and Clio. Swan also lead Venus’s chariot. Since antiquity it has been associated with the music, it was believed that swans sang sweetly just before dying. In contrast with the crow, which symbolizes night, the swan represents the light of day. In medieval bestiaries the swan was a symbol of hypocrisy because of its black flesh in contrast of white plumage. The main meanings are love, purity, virtue, hypocrisy. In the Tarot card The day of Judgment, the closest constellation to this enigma is the Swan of Leda, the final Conjunction. In Alchemy, swan is considered as a symbol of mercury. It represents the mystical union of opposites (water-fire), the Androgyne.