Vesica piscis
The vesica piscis is a geometric figure formed by the intersection of two circles of equal radius, each of which passes through the center of the other. The shared zone, in the shape of a vertical almond, is one of the fundamental symbols of Western sacred geometry.
Origin and etymology
The Latin expression vesica piscis literally means fish bladder, alluding to the oblong shape of the swimming organ. The geometric figure is attested in sacred architecture since Antiquity. The Pythagoreans of the 6th century BCE assigned it a cosmological meaning, as a matrix of several remarkable proportions: the square root of 3 naturally emerges from the height-to-width ratio of the vesica. Euclid, in the Elements in the 3rd century BCE, uses the construction of the vesica as the first proposition of his Book I to draw an equilateral triangle. The figure became a Christic symbol in the form of the ichthus (Greek fish) of the early Christian communities.
Evolution and tradition
Gothic architecture of the 12th century, particularly the stained-glass windows and portals of the cathedrals (Chartres, Notre-Dame de Paris, Reims), systematically uses the vesica piscis as a frame for representations of Christ in Majesty (the mandorla) and of the Virgin. This oval almond shape figures a sacred intersection zone between heaven and earth. Renaissance sacred geometry (Luca Pacioli, De divina proportione, 1509) takes up the vesica among the founding figures. 19th-century occultism (Eliphas Levi, MacGregor Mathers) and the Golden Dawn (1888) integrated it into their iconography. In the 20th century, Robert Lawlor (Sacred Geometry, 1982) popularized it within the New Age sacred geometry movement.
Practical use
Symbolically, the vesica piscis represents the union of polarities (two interlocking circles), the creative matrix (vulvic shape), and the intersection of the divine and the terrestrial. It is used in the design of mandalas, talismans, and architectural motifs. On Tarotoui, the vesica piscis is documented among the figures of sacred geometry. It appears in the background of certain tarot cards, notably the High Priestess (II) of the Rider-Waite, where it is suggested by the veil and posture. Tracing a vesica with a compass is one of the founding exercises in the practice of sacred geometry.
Going further
Modern sacred geometry, popularized by Drunvalo Melchizedek and others in the 1990s, attributes to the vesica piscis and to associated figures (Flower of Life, Egg of Life) metaphysical properties that are not recognized by historians of classical geometry. The distinction between historical symbolism (medieval architecture) and New Age reconstruction is useful. Note also that the vesica piscis has no power in itself: it is an elegant geometric form, with a vast symbolic reach but not magical in the literal sense.