Forms then slip away like ghosts into thin air, and the mind turns to boundless space, the fifth jhana, as the object of concentration.
This jhana is often called “Infinite Space”, as the next one is often called “Infinite Consciousness”, but I prefer the word “boundless”
because it is much closer to the actual experience of these stages. People imagine that they might simultaneously perceive the whole of space, but what actually happens is that the perceptual boundaries drop away and a very unitive openness prevails. This open quality itself becomes the primary focus rather than what is unified in that openness. This aspect was already present in the 4th Jhana, but now it comes to the fore. The same is true of the next formless realm.
This is not necessarily as perfectly clean as it sounds, depending on how solidly one in this state, but it still quite spectacular. When this state is really cultivated, all or most images and sense of a body are gone, and almost all that is left is vastness. There is still thought and the illusion of a separate self, i.e. duality, but the mind is extremely quiet and the duality subtle. The equanimity from the 4th Jhana remains, as the formless realms use this state as their foundation. Sounds might still be noticeable depending on the depth of the state. Note, if one attains this state while meditating with the eyes open it may have a very different quality to it than if the eyes are closed.
From this state, the meditator has a few options. They can get stuck, which may be more prone to happening if they are incorrectly practicing The Formless Realms
non-dual formless practices such as dzogchen by fixating too much on the phrase “space-like awareness.” They can also either go on to the next formless realm (boundless consciousness) or investigate this state and thus begin the progress of insight. If this last option is chosen, special care and extreme precision must be given to each and every instant that the many sensations that make up the perception of space, silence or equanimity are perceived so as to see each of these experiences arise and pass completely in each instant, not satisfy, and not be self.
It may seem odd to think of the sensations of space arising and passing away each instant, but space is a conditioned aspect of relative reality, and is thus impermanent like all other aspects of experiential reality. This can be an important attainment, as it clarifies that awareness, that non-thing that is often described as space-like, is actually not even space, though it is not separate from space, as in the chapter called No-self vs. True Self.
There are few things quite as odd, profound, and possibly
disconcerting as investigating the first three formless realms and perceiving them strobe in and out of existence, but this is powerful practice and a very valuable and high attainment. Again, this state may be left and insight practices begun with the benefits of the residue of this state calming, opening and stabilizing the mind for a short time after it ends.
BOUNDLESS CONSCIOUSNESS, THE SIXTH JHANA
If the meditator wishes to go further into the formless realms, then they should continue to cultivate attention to boundless space and begin to notice that they are conscious of all of it, and thus space is filled with consciousness. As some point the mind will abandon boundless space and shift to perceiving boundless consciousness, the sixth jhana. This can feel outrageously unitive, as consciousness seems to fill the whole universe. Space becomes “luminous,” and this can be confused with descriptions of the fundamental luminosity of awareness and with non-duality, though this is definitely not the attainment of the understanding of those. Again, equanimity prevails. This state has a sense of presence to it that boundless space doesn't. It is also a great staging ground for exploration of the “psychic powers.”
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The Formless Realms
From here the meditator has various options. They can get stuck, which can happen fairly easily if they are mistaking dzogchen or other non-dual formless practices for meditation on the concentration object of boundless consciousness, again due to misunderstanding or overemphasizing the phrase “space-like awareness.” They can also go on to cultivate the next formless realm (nothingness), or they can investigate boundless consciousness and then begin the progress of insight.
For this last option, extremely careful attention must be given to each moment that the sensations that make up the perceptions of consciousness, vastness, or equanimity arise and pass away. Great precision must be given to the fact that these sensations do not satisfy and cannot be self or imply a separate self. Because of how