...the ultimate nature or essence of the enlightened mind [byang-chub sems], which is uncreated (skye-med), free from the limits of conceptual elaboration (spros-pa'i mtha'-bral), empty of inherent existence (rang-bzhin-gyis stong-pa), naturally radiant, beyond duality and spacious like the sky. The intermediate state of the time of death ('chi-kha'i bar-do) is considered to be an optimum time for the realisation of the Buddha-body of Reality.
In Nyingma icons, Dharmakāya is symbolized by a naked, sky-coloured (light blue) male and female Buddha in union [Kāmamudrā], called Samantabhadra [and Samantabhadri].Unlike the 'form bodies' (Sanskrit: rūpakāya) of Sambhogakaya and Nirmanakaya, the Dharmakaya does not possess any 'divine attributes' nor 'ornamentation' (Wylie: phyag mtshan) as it is not only 'without form' or 'formless' (Sanskrit: arūpa) but beyond any concept, form, ornament, attribute or quality of the 'three realms' (Wylie: khams-gsum; Sanskrit: tridhatu). In the early traditions of what has been given the nomenclature Buddhism, depictions of the Shakyamuni Buddha were neither iconic nor aniconic but depictions of empty space and absence: petrosomatoglyphs and footprints, for example. This is a worthy visual device to draw attention to the 'absence' and 'emptiness' of "thus gone" (Sanskrit: Tathāgata) and the doctrine of Śūnyatā and represent whilst not representing. Later representations of the buddha were introduced as "skillful means" (Sanskrit: upāya). In the Dzogchen tradition, the Five Pure Lights which are the uncreated origin of the Five Wisdoms (the Five Wisdoms are the fabric of that which constitutes the Sambhogakaya, and this is common to both the Dzogchen traditions of the Nyingmapa and Bonpo), the colour blue is an iconographic polysemic rendering of the Mahābhūta (Sanskrit) element, the "pure light" of 'space' (Sanskrit: Ākāśa). Fremantle (2001: p.85) states:
Space is simultaneously the first and the last of the great elements. It is the origin and precondition of the other four, and it is also their culmination...The Sanskrit word for space is the same as for the sky: akasha, which means "shining and clear." What is it that we call the sky? It marks the boundary of our vision, the limit our sight can reach. If we could see more clearly, the sky would extend infinitely into outer space. The sky is an imaginary boundary set by the limitations of our senses, and also by the limitations of our mind, since we find it almost impossible to imagine a totally limitless [U]niverse. Space is the dimension in which everything exists. It is all-encompassing, all-pervading, and boundless. It is synonymous with emptiness: that emptiness which is simultaneously fullness.The conceptually bridging and building poetic device of analogy, as an exemplar where Dharmakaya is evocatively likened to 'sky' and 'space', is a persistent and pervasive visual metaphor throughout the early Dzogchen and Nyingma literature and functions as a linkage and conduit between the 'conceptual' and 'conceivable' (Sanskrit: citta) and the 'ineffable' and 'inconceivable' (Sanskrit: acintya). In particular refer the Gongpa Zangtal (Wylie: kun tu bzang po'i dgongs pa zang thal du bstan pa; English: Direct Revelation of Samantabhadra's Mind), a terma cycle revealed by Rigdzin Gödem (1337-1408) and part of the 'Northern Treasures' or 'Jangter' (chang ter; Wylie: byang gter).
During the Buddha's life great reverence and veneration was shown towards him by persons from the highest to the lowest social classes. The Buddha understood that this veneration was sometimes misguided based on superficialities and appearances and he warned people against turning him into an object of worship. Thus he forbade carvings and sculptures that represented his physical form. Nonetheless, a mythology developed concerning the physical characteristics of Universal Buddhas. In the Pali scriptures it is claimed that all Buddhas have the 32 major marks, and the 80 minor marks of a superior being. These marks are not necessarily physical, but are talked about as bodily features. They include the 'ushinisha' or a bump on the top of the head; hair tightly curled; a white tuft of hair between the eyes, long arms that reach to their knees, long fingers and toes that are webbed; his penis is completely covered by his foreskin; images of an eight-spoked wheel on the soles of their feet, forty teeth, etc. Clearly if these were physical marks the Buddha would have been a strange looking individual. But since not everyone was able to discern these marks on him, we can assume that they were either metaphorical, or a psychic phenomenon.
After the Buddha's Parinirvana a distinction was made between the Buddhas physical body, rupakaya; and his Dharmakaya aspect. This was an understandable and necessary development. As the Buddha told Vakkali, he was a living example of the 'Truth' of the Dharma. Without that form to relate to, the Buddha's followers could only relate to the Dharmakaya aspect of him. Despite the growth of the stupa cult in which the remains, or relics, of enlightened beings were worshipped, Buddhism sees such things as symbols of the Truth, rather than the Truth itself.
The Trikaya doctrine (Sanskrit, literally "Three bodies or personalities"; 三身 Chinese: Sānshén, Japanese: sanjin) is an important Buddhist teaching both on the nature of reality, and what a Buddha is. By the 4th century CE the Trikaya Doctrine had assumed the form that we now know. Briefly the doctrine says that a Buddha has three 'bodies': the nirmana-kaya or created body which manifests in time and space; the sambhoga-kaya or body of mutual enjoyment which is an archetypal manifestation; and the Dharma-kaya or 'Reality body' which 'embodies' the very principle of enlightenment and is omnipresent and boundless.
The Sambhogakaya is that aspect of the Buddha, or the Dharma, that one meets in visions and in deep meditation. It could be considered an interface with the Dharmakaya. What it does, and what the Tathagatagarbha doctrine also does, is to bring the transcendental within reach, it places the transcendental on the plane of immanence. Buddha dharma is essentially atheistic, in that it does not operate with a theistic transcendentalism, but rather eliminates such confusion. On the other hand it is erroneous to say that Buddha dharma rejects the existence of cosmic intelligence.
This key instruction, to rest evenly without grasping at origin, location, or cessation, points out the four kayas. It is the armor of view, the protection circle of emptiness, and the supreme instruction that cuts off confusion