Does he explain how the sun cannot be seen from space? That seems odd because if it emits light, it emits light. Any object should be able to receive the light.
I can see how AC would be a spiral instead of a wave, that makes more sense. In the same way, sound waves are most likely spirals or more like 3 dimensional waves we see in waves from the ocean. There is "mass" of sound vibrations within the perimeter.
Most of that is over my head anyways. But interesting none-the-less.