Attaining or achieving a so-called Rainbow Body is discussed in Tibetan Vajrayana Buddhist, Dzogchen, Zen , Bonpo, Vedic, Zoroastrian, Manichean, Christian, Sufi, etc. texts.
what a way to go
After death, skin loses its wrinkles, body starts to SHRINK, leaving only nails and hair or disappearing altogether, no remains, transformed into RAINBOWS. I.e. dissolution of the material body into LIGHT. This has been witnessed by many. Credible eye witnesses.
Recently, 1998, in the case of Khenpo A-Chos who practiced esoteric Dzogchen (Great Perfection). He had meditated in seclusion for 9 years. One can read online a detailed account of the strange phenomena surrounding his death. He is said to have achieved Buddhahood.
