The design on the wrought iron lid of the Chalice Well at Glastonbury is called "Vesica Piscis". The Chalice Well is the site of a very ancient, prehistoric sacred well; later, it was believed to be the hiding place of the Holy Grail. According to legend, this was also the Sacred Well of Avalon, home of the Priestesses of the Great Goddess of earlier, pre-Christian times; sacred to Bridgit, in whose honor Great Britain was named.

The design is comprised of two overlapping circles that intersect to form the outline of a fish - an early Christian symbol - or, when side by side, the vulva shape associated with the Goddess. The Vesica Piscis is a fitting symbol in that land, and time, where worlds intersect, where an experience of the grace of the transcendent God and the Sacred mysteries of the embodied Goddess come together.