The book, based on extensive material from ancient times to the present day, traces the ways of interaction and mutual enrichment of two great spheres of human culture - science and art, develops the core idea of the book - the idea of the unity of science and art, the unity of truth and beauty. Considering the 'mathematical principles' of formation in music, architecture and painting, the author shows that the deep, fundamental laws inherent in these types of art find adequate expression in the language of mathematics. The book is written brightly, excitingly and accessible, richly illustrated in color and designed for a wide range of readers.