The book is a rich combination of Makoorjee's scholarly style and an excellent collection of Tantric art, both geometric/diagramatic and visual, including the ever-popular Tibetan yab-yum pairs. I came upon the original edition as an undergraduate in the 1970s and was impressed then by the elaborate and in-depth scientific and metaphysical explanations of a complex and elusive topic -- tantra -- or the science and practice of first "seeing," then experiencing the essence behind form, not intellectually but with the perceptive faculties of one's inner being. His narration is interwoven with the illustrations to give the reader a clear sense of both the culture from which this body of knowledge arises and the subtle dynamics of tantric knowledge as revealed through art, ritual, and practice. Not a practitioner's guide, but an excellent introduction to tantric history, theory, metaphysics, and cultural expression.