Mandalas are also sacred enclosures, sacred architecture that house and contain the uncontainable essence of a central deity or "yidam" and their retinue. In the book "The World of Tibetan Buddhism", the Dalai Lama describes mandalas thus: "This is the celestial mansion, the pure residence of the deity." The Five Tathagatas or 'Five Buddhas', along with the figure of the Adi-Buddha, are central to many Vajrayana mandalas as they represent the "five wisdoms", which are the five primary aspects of primordial wisdom or Buddha-nature.