In Buddhism , the "world of immaterial form," the highest of the three spheres of existence in which rebirth takes place.
The others are the "fine-material world" ( rupa-loka ) and the "world of feeling" ( kama-loka ). In the arupa-loka , existence depends on the stage of concentration attained in the previous life, of which there are four levels: the infinity of space, the infinity of thought, the infinity of nonbeing, and the infinity of neither consciousness nor nonconsciousness. Beings in the arupa-loka do not have a material body.