Since the sand's motion is quite noticeable, I had the camera take pictures at a relatively high rate of two frames per second. My movie plays them back at 24 frames per second. We see 20 minutes of dripping sand in just a minute and 40 seconds! Exciting!
I taped a piece of white paper behind it to give it higher contrast than the wall would have. The paper is waving in a breeze and is kind of distracting.
One of the holes has some glue in the gap. Sand snags on it and it frequently clogs. Oh, well.
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