This unique publication is at the same time an illustrated reference book, a study of ancient books and works of art, a collection of popular science articles and spiritual and philosophical essays. In terms of breadth and depth of coverage of the topic, this book, created by the work of an international team of authors, has no equal among those published in Russian over the past 100 years.

The principles of the Quadrivium were first formulated by the ancient Greek thinker Pythagoras of Samos in the sixth century BC. The Quadrivium includes the following disciplines: Numerology (Arithmetic); Geometry – or Number in Space; Music (Harmony) – Number in Time; Cosmology – Number in Time and Space. These sciences provide the sincere seeker with a time-tested and wisdom-tested opportunity to gain an understanding of the world order and realize oneself as an integral part of it.

The book contains more than 2000 images grouped thematically. Many illustrations have not been published for more than 150-200 years, since they are taken from ancient books, many images were specially created for this publication using scientific computer programs.