Bruce Rawles, author of 2012’s The Geometry Code, defines sacred geometry as a way of understanding the underlying unity of the universe. “The principle of interconnectedness is what makes things sacred,” he says. “Sacred geometry is not really any particular object or form, but the idea behind it.” 

The phi ratio occurs across natural and human-made systems—from the spiraling seed heads of sunflowers to the proportions of the human body. Its power lies in its consistency. 

Well before Freemasonry took shape, these ideas were put to use by generations of architects, mathematicians, and philosophers working from a shared set of principles. Rawles points to the Great Pyramid of Giza, completed more than four millennia ago, where the phi ratio appears throughout its design. “The slanted height of the pyramid compared to half the base clearly demonstrates the golden ratio,” he notes. The precision points not just to technical mastery but to an effort to give abstract order physical form. 

Solomon’s Temple—completed in 957 BCE in Jerusalem—serves as a central allegory. Its orientation to the cardinal points and its use of proportion are often read in similar terms. Most lodges feature two ornamental pillars, Boaz and Jachin, recalling the great columns that once stood at the temple’s porch and representing the union of heaven and earth. 

In ancient Greece, geometry was the shared language of art and science. The philosopher Plato described a cosmos governed through reason, while Euclid, known as the “father of geometry,” established principles that continue to shape architectural thinking. The Pythagorean theorem—known in Freemasonry as Euclid’s 47th Problem—remains a symbol of order and integrity. 

Those ideas were adopted by the Roman architect Vitruvius, who described architecture as a way of giving physical form to universal patterns. “All machinery is brought forth from the nature of things,” he wrote in the late-1st century BCE, “and founded on the teaching and guidance of the revolution of the universe.”

The Pantheon, built in Rome in the 2nd century CE, is often cited as one of the clearest expressions of geometric order in architecture. Its dome and interior form a perfect sphere, while the oculus above tracks the movement of sunlight across the space over the course of a day. Centuries before the term sacred geometry emerged, the building demonstrated how proportion and light could shape both atmosphere and experience. 

Central to Vitruvius’s thinking was the belief that design should reflect the proportions of both the human body and the larger world. In his treatise, De Architectura, his description of a man inscribed within a circle later informed Leonardo da Vinci’s Vitruvian Man. By placing the figure within both a circle and a square—often read as symbols of the divine and the earthly, respectively—da Vinci gave visual form to the idea of man as a microcosm. 

That legacy continued in the Renaissance work of Venetian architect Andrea Palladio. His Four Books of Architecture were so revered by early Freemasons that they were sometimes read in place of Masonic constitutions. For Palladio, architecture was a “will to knowledge through form.” He identified the circle as the most perfect form, symbolizing unity and the infinite. At Villa La Rotonda, just outside Venice, a central oculus draws light evenly into the space, reinforcing the building’s symmetry and geometric balance. 

These shapely traditions resurfaced in Enlightenment Britain (1685–1815), where early Freemasons sought to replace “Gothick Rubbish”—so dubbed by the influential Scottish Freemason James Anderson—with a return to classical order. The English architect John Soane, a neoclassical specialist, applied symmetry, proportion, and spatial clarity to projects like Letton Hall in Norfolk. 

British architect and astronomer Sir Christopher Wren approached architecture in similar terms, treating his plans as “spiritual trestle-boards.” In buildings such as the Wren Library in Cambridge, that discipline appeared in ordered facades and measured proportions. The tools of geometry—the square, compass, and level—also carried symbolic weight, tied to ideals of self-refinement. 

In the 20th century, sacred geometry took on new forms. Swiss modernist Le Corbusier overlaid both historical and contemporary designs with what he called “regulating lines”—guiding geometries used to organize a building’s proportions and composition. His Modulor—a spatial system based on the human body—extends Vitruvian ideas into the modern world, as seen in projects like the Unité d’Habitation in Marseille, where proportions guide everything from room dimensions to the spacing and repetition of windows across the facade. 

Throughout California, these ideas surface in diverse forms. The classical symmetry and Greco-Roman allusions of the State Capitol are drawn from the pages of Vitruvius and Palladio, while the monumental dome at its center brings natural light to the ground floor. In San Francisco, the Cathedral of Saint Mary of the Assumption, designed by Italian architects Pier Luigi Nervi and Pietro Belluschi in 1971, joins together eight 190-foot hyperbolic paraboloids in a sweeping manifestation of the transition from the earthly to the divine. 

Sacred geometry moves across forms and periods, appearing wherever proportion, light, and structure converge. And while no two Freemasons define it quite the same way, it rarely resides in any one element. It shows up in the way parts align, how light enters a room, and how a structure holds together. Architecture is one way of making those relationships visible—not as a fixed formula, but as a pattern that repeats, shifts, and reappears across time.