Belief in the Heavenly nature of geometrical forms has existed since prehistoric times, but only now, in these pages, can we see and understand how this belief inspired the design of a great religious building. Without mathematical complexities, but in simple language and with many clarifying illustrations, the author demonstrates the geometrical constructions that the great architects of Canterbury Cathedral devised to bring the geometry of their building into harmony with that of the Universe, and with the geometries of their predecessors. The secret but simple means that they must have used to transfer plans to scale from parchment to building site is also brought to light, as is the geometry and remarkable history of the Cathedral's superb "marble pavement: .