Gharbadhatu Taizoukai (Womb World Mandala, Sanskrit = Garbhadhatu) is based on the Dainichikyou Sutra (Jp). Cited from Website Dainichi Purple Lotus This is the mystic lotus, represented only in images belonging to a few esoteric sects. The flowers may be in full bloom and reveal their heart, or in a bud. They may be supported by a simple stem, a triple stem (symbolizing the three divisions of Garbhadhatu: Vairocana, lotus and vajra.... http://www.buddhanet.net/e-learning/history/b_lotus.htm