<DIV>The quadrivium—the classical curriculum—comprises the four liberal arts of number, geometry, music, and cosmology. It was studied from antiquity to the Renaissance as a way of glimpsing the nature of reality. Geometry is number in space; music is number in time; and comology expresses number in space and time. Number, music, and geometry are metaphysical truths: life across the universe investigates them; they foreshadow the physical sciences. <br><P></P><br><P><I>Quadrivium</I> is the first volume to bring together these four subjects in many hundreds of years. Composed of six successful titles in the Wooden Books series—<I>Sacred Geometry</I>, <I>Sacred Number</I>, <I>Harmonograph</I>, <I>The Elements of Music</I>, <I>Platonic & Archimedean Solids</I>, and <I>A Little Book of Coincidence</I>—it makes ancient wisdom and its astonishing interconnectedness accessible to us today.</P><br><P>Beautifully produced in six different colors of ink, <I>Quadrivium</I> will appeal to anyone interested in mathematics, music, astronomy, and how the universe works.</P></DIV>