Ever wiggle a pencil in front of your eyes and it appears to be bending? This is result of our visual system having a limitation on the sampling rate speed it has. Remember that vision is a neural activity and neurons have to go through a very brief refractory period before they can fire again. If our sampling rate were higher, this is how something as simple as a rain drop would look - this is very cool!
And if you want, go this site that has a water drop synthesizer. Notice how you can change the frequency, variability, and number of drops to make it sound like a sink, bath-tub, or rain...
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