Plants including trees are important in mythology and religion, where they symbolise themes such as fertility, growth, immortality and rebirth, and may be more or less magical.[91][92] Thus in Latvian mythology, Austras Koks is a tree which grows from the start of the Sun's daily journey across the sky.[93][94] A different cosmic tree is Yggdrasil, the World tree of Norse mythology, on which Odin hung.[95][96] Different again is the barnacle tree, believed in the Middle Ages to have barnacles that opened to reveal geese,[97] a story which may perhaps have started from an observation of goose barnacles growing on driftwood.[98] Greek mythology mentions many plants and flowers,[99] where for example the lotus tree bears a fruit that causes a pleasant drowsiness,[100] while moly is a magic herb mentioned by Homer in the Odyssey with a black root and white blossoms.[101] Magic plants are found, too, in Serbian mythology, where the raskovnik is supposed to be able to open any lock.[102][103] In Buddhist symbolism, both the lotus and the Bodhi Tree are significant. The lotus is one of the Ashtamangala (eight auspicious signs) shared between Buddhism, Jainism and Hinduism, representing the primordial purity of body, speech, and mind, floating above the muddy waters of attachment and desire.[104] The Bodhi Tree is the sacred fig tree under which the Buddha is said to have attained enlightenment; the name is also given to other Bodhi trees thought to have been propagated from the original tree.[105]