Nirmāṇakāya
Nirmāṇakāya (Sanskrit; ; Tib. སྤྲུལ་སྐུ་, "tulku", Wyl. "sprul sku") is the third aspect of the trikāya and the physical manifestation of a Buddha in time and space. In Vajrayāna it is described as "the dimension of ceaseless manifestation." Indian Buddhism. One early Buddhist text, the Pali "Samaññaphala Sutta", lists the ability to create a “mind-made body” ("manomāyakāya") as one of the "fruits of the contemplative life". Commentarial texts such as the "Patisambhidamagga" and the "Visuddhimagga" state that this mind-made body is how Gautama Buddha and arhats are able to travel into heavenly realms using the continuum of the  mindstream ("cittasaṃtāna") and it is also used to explain the multiplication miracle of the Buddha as illustrated in the "Divyavadana", in which the Buddha multiplied his "nirmita" or emanated human form into countless other bodies which filled the sky. A Buddha or other realized being is able to project many such nirmitas simultaneously in an infinite variety of forms in different realms simultaneously. The Indian Buddhist philosopher Vasubandhu (fl. 4th to 5th century CE) defined "nirmita" as a siddhi or psychic power (Pali "iddhi", Sanskrit: "ṛddhi") developed through Buddhist discipline, concentrated discipline ("samadhi") and wisdom in his seminal work on  Buddhist philosophy, the "Abhidharmakośakārikā". Asanga's "Bodhisattvabhūmi" defines nirmāṇa as a magical illusion and "basically, something without a material basis." The Madhyamaka school of philosophy sees all reality as empty of essence; all reality is seen as a form of nirmita or magical illusion. Tibetan Buddhism. In Tibetan Buddhism, nirmanakayas are emanations of the Sambhoghakaya of the Buddhas, which effortlessly arise due to the compassionate energy ("thugs rje") of the Buddhas. According to Jigme Lingpa, nirmanakaya (emanations) appear "according to the different perceptions, dispositions, and aspirations" of sentient beings. He also states that "their enlightened activities, which remove the delusions  of samsara, are as limitless as the boundless reaches of space." In Tibetan Buddhism, there are various types of tulkus or nirmanakaya. According to the Nyingma scholar yogi Jigme Lingpa, the main classifications include: