The Quadrivium consists of four Liberal Arts of Number, Geometry, Music, and Cosmology, studied from antiquity to the Renaissance as a way of glimpsing the nature of reality. They synthesize number, space, and time. Geometry is number in space, music is number in time, and the cosmos expresses number in space and time. Number, music, and geometry are metaphysical truths, good and beautiful everywhere at all times. Life across the universe investigates them. They foreshadow the physical sciences. This is the first volume to bring together the Quadrivium inm any hundreds of years.

Sacred Number was originally published by Walker & Company in 2005. Sacred Geometry was originally published by Walker & Company in 2001. Platonic & Archimedean Solids was originally published by Walker & Company in 2002. Harmonograph was originally published by Walker & Company in 2003. The Elements of Music was originally published by Walker & Company in 2008. A Little Book of Coincidence was originally published by Walker & Company in 2002.

Sacred number / Miranda Lundy -- Sacred geometry / Miranda Lundy -- Platonic & Archimedean solids / Daud Sutton -- Harmonograph / Anthony Ashton -- The Elements of music / Jason Martineau -- A little book of coincidence / John Martineau.