However, in nature there is a different kind of movement, a second type of movement, different from the movement of mass in space and time. That is the wave-shaped movement. This movement is more abstract, more elusive, but we will see that it basically parallels the movement of mass. Even the wave motion can be more fundamental than the mass movement. How is the wave? Time spent with books and cats is never wasted poster. Throw a stone in the middle of a quiet lake, you will see the water waves are generated and gradually spread on the lake surface. That is a waveform.
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