Watching a sheet of water-soluble ink flow is deeply satisfying in some way I don’t quite understand.
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drill pinhole in 2L bottle cap. Fill with dish soap & water. Thread two strands of fishing line between cap and weight. Hang bottle inverted
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want trickle of soapy water (I think I put a valve on a piece of aquarium tubing to control flow?) If right, continuous descending gradient
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