So if the ideas of relativity seem weird, it is only because we don't experience these sorts of interactions in normal life. However, to turn to Bodanis again, we all commonly encounter other kinds of relativity--for instance with regards to sound. If you are in a park and someone is playing annoying music, you know that if you move to a more distant spot the music will seem quieter. That's not because the music is quieter, of course, but simply that your position relative to it has changed. To something too small or sluggish to duplicate this experience--a snail, say--the idea that a boom box could seem to two observers to produce two different volumes of music simultaneously might seem incredible.
--Bill Bryson, "A Brieft History of Nearly Everything"
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