Ancient Egyptian Eye of Ra
The eye of Ra-Atum is the mythological symbol for the sun. At one point, Shu and Tefnut twin children of Ra-Atum, were separated from him. He sent his eye to find them. While the eye was searching, Ra-Atum replaced the eye with another.
When the eye returned with Shu and Tefnut, Ra-Atum wept with joy, and the tears created humankind.However, the eye was enraged at having been replaced.
Ra-Atum placed the eye on his forehead so that the eye could rule the world; thus becoming associated with the sun. The second eye is associated with the moon.