The teaching of the Illusory Body will be discussed in three steps: the Illusory Body practice on the manifestations; the Illusory Body practice on the dream state; and the Illusory Body practice on the Bardo state.
With a decisive understanding or View on Sunyata, the yogi associates this view with the Innate-Born Bliss in meditation. After the meditation period, through remembering the View and remembering that all manifestations are , the yogi will naturally experience, in all daily activities, the feeling that all manifestations are immanently illusory. He will also see all manifestations illustrating themselves in the forms of Mandalas. For these (capable) yogis, of course, there is no need for any visualization practices.
But in order to benefit those who cannot do the same in their meditation, the following practice is advised: In the after-meditation period, the yogi should observe the non-self nature of all Dharmas--the sentient beings and the material world--and identify his body with his image reflected from the mirror. Through this practice, the common
visions of sentient being and universe[r_nar:77] will appear as mirage without any substance or self-nature. this experience can be stabilized, all manifestations appear in the form of the two Mandalas[r_nar:78]. With an of the mirage-like nature, or with the view of the identity of non-self-nature Voidness and manifestation, the yogi observes the pure Mandala. And then he looks into the mirror and identifies the godly image there with his own body. In this way, the mirage-like nature of Buddha's body is observed.
With such an understanding, the yogi observes the Buddha's body in the mirror and concentrates upon it. Then he should think that this image of Buddha projects itself and merges with him. Since the former practice is a complete process, its power is much greater than that of the latter.
As instructed in The Five Steps, the picture of an image of Vajrasattva is reflected in a mirror so that by looking at this reflection, the yogi may observe the nature of the Illusory Body. Following this instruction, the two gurus, Marpa and Agog Lodrawa, have established this teaching to benefit those disciples who cannot quite understand the illusory nature of beings merely through hearing it explained. For that reason, this seeing-practice is given. To practice this teaching in the Arising Yoga, a specially constructed house is required; many different drugs and other materials are also needed. After all the preparations are arranged, the yogi then proceeds to observe the reflection of the image in the mirror. These instructions are found in both Marpa's and Agog's teachings.
(Generally speaking) there are two different aspects of the illusory-like and dream-like nature of all Dharmas:[r_nar:79] the existent-but-not-real aspect, and the manifesting-yet-void aspect.