'**Quadrivium**: The Four Classical Liberal Arts of Number, Geometry, Music, & Cosmology' is a 🏷️#book number, geometry, music, and cosmology—studied from antiquity through the Renaissance as a framework for understanding the nature of reality. Geometry is described as number in space, music as number in time, and cosmology as number in both space and time. These disciplines were historically regarded as metaphysical truths and precursors to the physical sciences. The book Quadrivium compiles six titles from the Wooden Books series—Sacred Geometry, Sacred Number, Harmonograph, The Elements of Music, Platonic & Archimedean Solids, and A Little Book of Coincidence—to present interconnected knowledge in mathematics, music, and astronomy. Wooden Books, founded in 1999 by designer John Martineau near Hay-on-Wye, aims to create eco-friendly, timeless works using recycled materials, hand-drawn illustrations, and classic typography. The series follows a compact format of text facing illustrations, inspired by the Beatrix Potter model, and has sold over one million copies worldwide. Quadrivium is noted for its six-color printing and broad appeal to readers interested in the structure and workings of the universe.
