ABSTRACT
The model of the "three realms" or "three existential horizons" involves some of the most intricate and hair-splitting distinctions in Buddhist doctrine. It has been applied to cosmology, classifications of meditation levels, rebirth schema, and the hierarchical categorizing of psychological situations. As with the previous model, the description here will be far from exhaustive, but rather will aim at orienting the reader toward very basic but significant issues that will help prepare the way for understanding how this model came to be appropriated and utilized by Y ogäcära.
