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When people say movement, a physicist thinks "displacement".
While the light itself is moving, light is not movement.
If you have a wave on a string, that's called a displacement wave. Bits of string Literally MOVE. The Medium is moving. (Of course, the wave itself is also moving.)
If you have a sound wave, the air molecules are moving. They vibrate back and forth.
But with light, the light itself may move, but there is no physical object moving that is associated with the Medium.
Again, refer to my analogy to the stock ticker. You can create little scrolling symbols moving across the stock ticker. The little symbols are like light waves. They move. But the Medium, the stock ticker, is not moving.(It's not like the light bulbs wiggle around or anything).
That's what I mean when I say light is not movement. It's not associate with the dispacement of any medium. Is the light moving? Yes. Is the light movement? No.
At least, that's the way I see it. The term 'movement' is not exactly a precise term in physics lingo, so I suppose the answer is really dependent on how you define 'movement'.
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And if you say to me tomorrow, oh what fun it all would be.
Then what's to stop us, pretty baby. But What Is And What Should Never Be.
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