Eternal return
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In philosophy, eternal return is the concept stating that time repeats itself in an infinite loop, and that exactly the same events will continue to occur in exactly the same way, over and over again,
Nietzsche wrote that the concept of eternal return first occurred to him at Lake Silvaplana in Switzerland, "beside a huge rock that towered aloft like a pyramid".
Ouroboros
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The ouroboros or uroboros is an ancient symbol depicting a snake or dragon eating its own tail. The ouroboros entered Western tradition via ancient Egyptian iconography and the Greek magical tradition
Eternal return
…List of films featuring time loops Ouroboros – Symbolic serpent with its tail in its mouth Poincaré recurrence theorem…
A dragon-like ouroboros in a 1478 drawing in an alchemical tract
First known representation of the ouroboros, on one of the shrines enclosing the sarcophagus of Tutankhamun
A highly stylised ouroboros from The Book of Kells, an illuminated Gospel Book (c. 800 CE)
Engraving of a wyvern-type ouroboros by Lucas Jennis, in the 1625 alchemical tract De Lapide Philosophico. The figure serves as a symbol for mercury.