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The Vesica Piscis is the almond-shaped intersection formed when two circles of equal radius overlap so that the centre of each lies on the circumference of the other. It is the geometry of creation, the womb from which all other sacred forms emerge. Found in the Chalice Well cover at Glastonbury and in countless medieval church windows, this is the foundational construction of sacred geometry.
Mark a single point at the centre of your working area. This is point A, the origin from which all geometry springs.
Place the compass point on A and draw a full circle with any convenient radius. This is your first circle — the unity from which duality will emerge.
Without changing the compass width, mark point B where the circle crosses a horizontal line through A, on the right-hand side.
Place the compass point on B and draw a second circle of equal radius. The two circles now overlap, creating the vesica — the almond-shaped lens at their intersection.
Mark the two points where the circles intersect — call them C (top) and D (bottom). These define the vertical axis of the vesica.
Using your straightedge, draw a vertical line through C and D. This is the axis of symmetry of the vesica piscis and is perpendicular to the line AB.
Draw the line AB with your straightedge, connecting the two centres. The vesica piscis is now complete — the ratio of the vesica's height to its width is the square root of 3, one of the most important ratios in sacred geometry.