Synopsis To felicitate Dr. Musashi Tachikawa on his sixtieth birthday this book presents a collection of fifty-six essays which are related to Prof. Tachikawa’s fields of research. In chronological order, these are Nagarjuna’s Madhyamika Philosophy, Indian Realism, Buddhist and Hindu Tantrism, and Buddhist Theology. The study of Buddhist and Hindu Tantrism covers both iconography and rituals. At first glance their mutual relationship is not clear, but Prof. Tachikawa’s methodology makes us understand just how deeply related these are. His study is deeply rooted in Philology, involving Sanskrit and Tibetan original texts. It is also characterized by making use of comparative philosophical working concepts such as Indian realism and Indian nominalism, the sacred and the profane. In view of these fields of study of Prof. Tachikawa, scholars from various fields have shared and contributed their essays in this felicitation volume. The articles have been organized in thirteen sections. These sections throw new light on enduring themes in Indian studies as well as on fresh issues.