The five graduated series of universes: (1) 三千大千世界tri-sahasra-mahā-sahasra-loka-dhātu; a universe, or chiliocosm; (2) such chiliocosms, numerous as the sands of Ganges, form one Buddha-universe; (3) an aggregation of these forms a Buddha-universe ocean; (4) an aggregation of these latter forms a Buddha-realm seed; (5) an infinite aggregation of these seeds forms a great Buddha-universe, 智度論 50. Another division is (1) a world, or universe; (2) a Buddha-nature universe, with a different interpretation; and the remaining three areas above, the sea, the seed, and the whole Buddha-universe.