Other References
The Jungian psychologist Erich Neumann writes of it as a representation of the pre-ego "dawn state", depicting the undifferentiated infancy experience of both mankind and the individual child.
The 19th century German chemist named Kekule dreamed of a snake with its tail in its mouth one day after dosing off. He had been researching the molecular structure of benzene, and was at a stop point in his work until after waking up he interpreted the dream to mean that the structure was a closed carbon ring. This was the breakthrough he needed.
Organic chemist August Kekule claimed that a ring in the shape of Ouroboros that he saw in a dream inspired him in his discovery of the structure of the benzene ring.
Today the Ouroboros is often found as a tattoo.
The X-Files' Dana Scully chose the Ouroboros to be tattooed on her back because she felt it represented the progression of her life. It seems that the Ouroboros is a powerful archetypal symbol, a part of our Spiritus Mundi, the collective unconscious which thrives within each soul.