Often grouped into the "jhāna"-scheme are four other meditative states, referred to in the early texts as "arupa samāpattis" (formless attainments). These are also referred to in commentarial literature as immaterial/formless "jhānas" ("arūpajhānas"). The first formless attainment is a place or realm of infinite space ("ākāsānañcāyatana") without form or colour or shape. The second is termed the realm of infinite consciousness ("viññāṇañcāyatana"); the third is the realm of nothingness ("ākiñcaññāyatana"), while the fourth is the realm of "neither perception nor non-perception". The four "rupa-jhānas" in Buddhist practice lead to rebirth in successfully better "rupa" Brahma heavenly realms, while "arupa-jhānas" lead into arupa heavens.