A good visual analogy to describe dimensions is to visualize a thick book.
Each page of the book would represent a different dimension, and the total book would represent all creation. Also, visualize if you can, the idea that each page represents a different vibrational frequency range.
Now visualize also, that each page does not occupy its own space, but rather all pages occupy the “same” space, and are separated according to their own individual frequency range.
And lastly visualize that the individual pages of this book extend outward in all directions on to infinity.