Anytime we visualize light / sound waves they are 2 dimensional drawing, so how do they actually work in a 3 dimensional space? Are they more like ripples (like a stone thrown into a pond)?
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Think of blowing up a balloon. That can be thought to represent an expanding pressure front in three dimensions. The two-dimensional representation would simply be the position of the surface of the balloon on a plane intersecting it.
The waves themselves would consist of multiple such fronts, so it would be a bit like blowing up a balloon that was inside another expanding balloon that was inside another expanding balloon, etc.
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