by reference to the super-string theory, you can try to imagine this:
- think about a little segment(a little immaterial wave) |------------| if you bend it enough, you can make a "vibrating" circle. For this, you
need 2 dimensions
- now think about a little surface, still vibrating... if you bend it, you can make a sphere (again vibrating). For this, you need 3 dimensions
- finally you can extend this though to a volume (to imagine it vibrating, think about the sound propagating in the air, or the light since we speak
about immaterial object). If you can "bend" it, you can obtain a plain ball or a particule. For this you just need 4 dimensions (I'm not speaking
about time-dimension, of course).
it's maybe not the "reality"... but I hope it helps your immagination