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1D, 2D, 4D, all are imaginary. The only space available in the physical world is 3D.

That's actually not true CTD. It would be more appropriate to say, the only experiences we can fully comprehend exist within our 3D perspective of space, and within our abilities to comprehend.

We, as human beings actually have very little capacity to fully experience all of the things that science has truly discovered, truly discovered. Take light as a simple example... colors. There are so many colors available within the spectrum of light, and they can be measured and they can be viewed, with some help (filters) here and there as we know how to proceed in that direction to view things (infrared for example). But as human beings, our eyes can only perceive so many colors within the spectrum of light as we know it/ We cannot see infrared light with our eyes, yet there is no doubt this wavelength exists. Science so far has measured an enormous quantity of available light waves, now don't quote me insofar as exact numbers but it's along the lines of something like 100,000 various different wavelengths (infrared being one, blue another. red another, and yellow for instance) and we view our entire human existence-experience with only three, the blue, red and yellow. A teeeny teeeny fraction of available light wavelengths are available to our eyes.

Sound is another example. sound actually has sort of volume, but we only perceive that part of the volume which intersects our space in a certain way and vibrates our eardrums in ways that we recognize.

these things are not imaginary CTD. The list is quite long.
I'm talking about the physical world.

I'm also talking about spacial dimensions. Other "planes of existence" and realms may have other properties.

Light & sound, regardless of wavelength still operate 3 dimensionally. This is even true of polarized light. It's true of all waveforms and fields as well. Everything has height, width, and length. Now that I think of it, light is the most blatantly 3D of all phenomena. It consists of 2 waves at 90 deg. to each other and at 90 deg. to the vector. All perfect right angles. Coincidence?

Now if there are unobserved things that operate after some other fashion, that's not what I'm talking about.

Dark Matter + Dark Energy = Dark Truth

"We find that such evidence demonstrates that the ID argument is dependent upon setting a scientifically unreasonable burden of proof for the theory of evolution." - Judge Jones Kitzmiller case
http://www.talkreason.org/articles/Falsify.cfm

"To Compel A Man To Furnish Funds For The Propagation Of Ideas He Disbelieves And Abhors Is Sinful And Tyrannical." - Thomas Jefferson

"And can the liberties of a nation be thought secure when we have removed their only firm basis, a conviction in the minds of the people that these liberties are the gift of God? That they are not to be violated but with his wrath?" - Thomas Jefferson