Some of the Śaiva schools of philosophy describe yoga as being of five kinds, one of which is abhāva-yoga. In this state, the fourth yogic plane to be ascended, the yogi transcends the world appearance in its various forms. He is not concerned with the world. To him, the world has practically disappeared. Hence the name abhāva-yoga, the mystic experi-ence (yoga) in which the world has been negated (abhāva).