Beautiful Michio Kaku reference
I like the idea that the 4ourth dimension can mean time.
With this in mind it becomes feasible to understand that if there were an astral body it would be an object which one's consciousness could identify with on a plane outside of time.
Tough to imagine existing outside of time.
It seems as if Now is now.
Within time, most human consciousness identifies with a mind which exists in a 2-dimension way, and identifies with the sense-impressions, which exist in a 3 dimensional way, one's consciousness finds itself thoroughly absorbed within the envelope of time, in a constant and incredibly fast oscillation between the 2d and 3d world.
If one finds a way to create space between one's consciousness (essentially an 11th dimensional object from one angle) one may find that object which may step outside of time.
The astral body participates in the cross-section between infinity-consciousness and now-consciousness, allowing one to follow the state of Now in the world of forms, but remain connected to the 11d infinity-energy-blanket.
In my opinion, time is a 2d phenomenon, an illusory projection created by Mind.
The body itself is a four-dimensional object, however consciousness itself is not the body, and thus is generally is in a state of flux between the 2nd and 3rd dimensions.
To bring consciousness to the fourth dimension simply means stepping outside of mind, and not identifying with the three dimensional sense-impressions.
The heart Chakra creates an electro-magnetic field, if one activates it. A magnetic field is a 6 dimensional object!
Source:
"In electromagnetism, the electromagnetic field is generally thought of as being made of two things, the electric field and magnetic field. They are both three-dimensional vector fields, related to each other by Maxwell's equations. A second approach is to combine them in a single object, the six-dimensional electromagnetic tensor, a tensor or bivector valued representation of the electromagnetic field. Using this Maxwell's equations can be condensed from four equations into a particularly compact single equation:"
I can't prove that activating the heart chakra, creates a magnetic field, I suspect it just infuses the already electro-magnetic field with conscious awareness.
Constantly magnetized by the Green Chakra is the Yellow Chakra, the solar plexus is a 5 dimensional object!
"The Kaluza–Klein theory used the fifth dimension to unify gravity with the electromagnetic force"
(both sources from wikipedia)
Breath follows eternal now, and so breath is a 4 dimensional phenomenon which consciousness has the capability to be conscious of. One can then folow these life-forces travel through the body while remaining conscious of the breath. This is pulling consciousness out of the swamp of the 2nd and 3rd dimensions, up the stalk and eventually to the 6 dimensional lotus-flower.
In this analogy, the fifth dimension is the Bud of the flower, the leaves are 4 dimensional, as well as the whole stalk and the mud itself.
However the mind which remains linear, and the connection between the brain and the sense organs creates a 2 dimensional and 3 dimensional picture for the pyramid of 4 dimensional, 6 dimensional and 11 dimensional consciousness to use for its own growth as a flower.
Now.
Of course I cannot bring any reliable evidence, and none of these theories are intended to be taken as fact, simply intellectual ways to understand the multi-dimensionality of the human being.
I personally believe that the 3rd eye is the portal to containing for containing Brahma (11 dimensional object)
In string theory, the last 6 dimensions, 6-11 are of the invisible world.
1-5 can be measured, this is within physics.
However within metaphorical physics, ne can't actually percieve past the third dimension, unless there is an Astral body, or a 4 dimensional object which uses its connection to the 6th dimension to percieve itself and other objects of that dimension.
I would personally suspect that the fourth plane would be like being aware of the essence of the world around.
The gross world is a product of human perception, and exists at the cellular level. All types of cellular organisms supporting eachother.
The subtle world, the reality of our existence is 4 dimensional, the reality is Molecular.
Things which emit odors for instance are molecularly volatile.
If one had a body on the 4th plane (Astral plane, according to many of the spiritual authorities which i have read) one could be aware of the true molecular nature of things.
One could possibly SEE the radiations of stinky objects, and if one were able to move through the 4th plane from the 6th plane, one could likely understand the effect that the molecules of an apple might have on the molecules of a human being.
One would associate molecular apple with molecular growth of human beings, or something like that.
It is even possible to achieve this understanding while in the Human Cellular form,
one simply has to pull his consciousness out of the swamp and be aware of the Lotus which one truly is.
Then there is still the further intellectualism about Brahma, the connection between all humans. This. The true reality, "11d".