Extra Dimensions

[Tiberius]

Is there any actual proof of the existence of Dimensions beyond what we can experience or is the existence of these dimensions only postulated in theory or in support of theory.

It depends on which kind of dimensions you are talking about, and whether you are talking about mathematical proof or empirical proof.

In mathematics, calculations are done with many many dimensions and some parts of math rely on them to exist. In physics, it is generally accepted that there are 3 spacial dimensions and one of time, but others may exist (though there is no evidence that they exist). Some theories propose many other spacial dimensions.

In the case of spacial dimensions, proof of extra dimensions would not necessarily require us to experience them for ourselves. For example, a 2 dimensional being would be able to see a 3 dimensional object, but only as its 2 dimensional representation in the 2 dimensional universe.

If a sphere was placed in the 2 dimensional universe, any 2 dimensional beings would see it as a zero-dimensional point. If the sphere then moved through the 2 dimensional universe (i.e. down in the 3rd dimension, and not forward/back/left/right 2 dimensionally), then the 2 dimensional being would see the same point become a circle that got bigger and bigger, before getting smaller and smaller again, becoming a point and then finally disappearing.

Edited to add: Darwinian's avatar is the 2D representation of a 3D rotation of a 4D hypercube.