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In Vajrayana Buddhism, the Womb Realm (Sanskrit: garbhakoṣadhātu, Japanese: 胎蔵界 taizōkai) is the metaphysical space inhabited by the Wisdom Kings. The Womb Realm is based on the Mahavairocana Tantra. The name of the mandala derives from chapter 2 of the sutra, where it is said that the buddha Mahāvairocana revealed the mandala's secret teachings to his disciple Vajrasattva from his "womb of compassion". In other translations, the term matrix realm or Matrix Mandala are used.
The Womb Realm is a very popular subject for mandalas, and along with the Diamond Realm (vajradhātu) Mandala forms the Mandala of the Two Realms. This mandala, along with the Diamond Realm, form the core of Japanese Tendai and Shingon Buddhist rituals, including abhisheka "initiation". In this ritual, new initiates are blindfolded and asked to toss a flower upon a mandala. Where the flower lands helps decide which Buddhist figure the student should devote themselves to.
In traditional Shingon halls, the Womb Realm Mandala is hung on the east wall, symbolizing the young stage of Mahāvairocana.In this setting, the Diamond Realm Mandala is hung on the west wall symbolizing the final realization of Mahāvairocana.