Illustration by Helena Forde (Scott) of the Black Snake, plate 13 from Snakes of Australia by Gerard Krefft. This book was illustrated by Harriet Scott and Helena Forde (Scott) and published in Sydney,
Ouroboros: An ancient symbol frequently used in alchemical illustrations to symbolize the circular nature of the alchemist's opus. Often represents self-reflexitivity or cyclicality, especially in the sense of something constantly recreating itself.
Ouroboros is traditionally depicted as a serpent or dragon swallowing its own tail, resulting in a circle. The ouroboros is regarded as a symbol of infinity and renewal. It has also been used as a symbol for totality, mercury, and truth.