In 3100BC, in Heliopolis, Egyptian scholars derived a creation myth, based on the movements of the stars, the sun, and the annual Nile River flood, according to which water was first, symbolized by the god Nun, out of which land or the god Atum arose, out of which the sun or the sun god Ra burst forth and flew into the sky carried by the benu bird (aka phoenix). In 600BC, Thales traveled to Egypt and from them acquired the water as first principle theory, from which fire and earth were derived. In 500BC, Heraclitus expanded on Thales water model into the form of the three element theory, namely that things are comprised of water, earth, and fire. This eventually became the four element theory, namely that all things are comprised of water, earth, fire, and air, a theory which held sway up until the time of Percy Shelley.
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