You probably are familiar with the situation. You're trying to explain the arrival of seismic waves to your class. Or maybe it is your spouse (or child, grandparent, parole officer, whatever). You are excited and enthusiastic, talking about frequencies and wavelengths, dispersion, Hilbert transforms, and so on, and all you get in return is blank stares. They don't get it. The problem is that you are showing them a static black-and-white image of squiggly lines, and you just can't get them to see the dynamic motions and transfers of energy involved. You wish you had an actual seismometer to whip...
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