There are things that work like swings.
If you don’t touch the swing it doesn’t swing. If you disturb it, it starts to swing.
EM spectrum, liquid surfaces, vibrations including sound. These are all things that stay flat until disturbed, if you disturb them they start to swing “up and down” until they dissipate the energy you put in there.
Example: you drop a stone in the lake, the water is pushed down, bounces up, and the water around is affected and start copy that, and this makes the concentric waves. There’s simply nothing else the water can do, it’s not a solid, it can’t bounce the rock, it has to give cat to the rock. Doing so some rock energy moves the water and the water keeps moving until that energy is gone, dissipated by waves that lose energy when hitting the coast, and dissipate energy in heat due to liquid viscosity.
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