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Odyssèus
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Hologram? You could easily (With the tech level required to simulate an entire world/universe) stimulate some nerves and pick up signals from others.
You learn how to interpret these signals when your a baby, if you grew up in a simulation you could never tell the difference. In fact, the 'real
world' might even feel very strange. You wouldnt nessesarily look anything like you do also, or even human, not to mention you could be a mostly
disembodied brain. Well, brain is a thing defined by our science, if you had such a simulation you could make up whatever science or biology you
wished.
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IrC
International Hazard
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One exaustive study implied the entire brain works on the principle of holgraphy. Rats trained in a maze could still remember the correct path, even
when bit by bit a section of the brain was removed. They were trying to figure out where the memories were stored, and removed piece by piece
everything not needed for such things as motor responses, breathing, and so on. They became more and more astounded that the rat still remembered the
maze on the first try each time. Finally they started theorizing that each section holds an image of each memory precisely as in a hologram. Other
theorists are studying/working on the idea that the physical universe is a hologram made up of the energy within it but I really have not read up
enough on their approach to comment a whole lot.
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12AX7
Post Harlot
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Simple: a "space" is the set of all points.
Thus, you can define a function f(x) where all points x correspond to some value f(x). This can be extended to more dimensions: f(x,y,z) for instance
(or f(r, phi, theta) if you prefer spherical coordinates; etc.).
Sometimes things don't move very well, so you might include a series of functions x(t), y(t), z(t) so that the variables all depend on a single
parameter. Substituting, you get f(t), a simple function when complex functions of t are used.
Parametric equations may or may not be particularly useful. I haven't studied general relativity or quantum mechanics. But in any case, it isn't
much of a stretch to use the same mathematical extension into four dimensions, giving a function f(x,y,z,t), where every point in, for lack of a
better term, "space-time", has an associated value. Just like a field equation.
So, just from a purely mathematical point of view, what's wrong with having properties associated with a space? Okay, math isn't reality...but hey,
so damn many things act on mathematical principles; is it such a stretch to imagine there are electromagnetic field properties associated with simple
"empty space"?
The real questions we should be pondering are,
What caused the "Big Bang", or else, what produced the evidence of it?
Why are the relations between the fundamental physical constants? Why are they the value they are? Why aren't they an even number, or a multiple of
some other irrational constant (such as pi, or e)? What would be the consequences if the values were different, or changed (perhaps over time)?
(Could you tell?  )
Tim
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Odyssèus
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Oh, thought you meant illusion-hologram sort of thing. 
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