A myth about the Eye, known from allusions in the Coffin Texts from the Middle Kingdom (c. 2055–1650 BC) and a more complete account in the Bremner-Rhind Papyrus from the Late Period (664–332 BC), demonstrates the Eye's close connection with Ra and Atum and her ability to act independently. The myth takes place before the creation of the world, when the solar creator—either Ra or Atum—is alone. Shu and Tefnut, the children of this creator god, have drifted away from him in the waters of Nu, the chaos that exists before creation in Egyptian belief, so he sends out his Eye to find them. The Eye returns with Shu and Tefnut but is infuriated to see that the creator has developed a new eye, which has taken her place. The creator god appeases her by giving her an exalted position on his forehead in the form of the uraeus, the emblematic cobra that appears frequently in Egyptian art, particularly on royal crowns. The equation of the Eye with the uraeus and the crown underlines the Eye's role as a companion to Ra and to the pharaoh, with whom Ra is linked. Upon the return of Shu and Tefnut, the creator god is said to have shed tears, although whether they are prompted by happiness at his children's return or distress at the Eye's anger is unclear. These tears give rise to the first humans. In a variant of the story, it is the Eye that weeps instead, so the Eye is the progenitor of humankind.