Formless realm

Formless realm (Skt. arūpadhātu; Wyl. gzugs med khams) — the third of the three realms, where gods without any form dwell in four types of perception spheres.

Four Perception Spheres (skye mched mu bzhi)

1. Infinite Space (nam mkha’ mtha’ yas)
2. Infinite Consciousness (rnam shes mtha’ yas)
3. Nothing Whatsoever (ci yang med pa)
4. Neither Existence Nor Non-existence (yod min med min)