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when toggle format what by license comment
Jul 6, 2017 at 7:36 history edited Michael Karas CC BY-SA 3.0
deleted 1 character in body
Jul 6, 2017 at 3:09 comment added dandavis i was thinking about a neon-painted BB inside a short tube with one end clear, that an electromagnet could push back and forth, or a half-colored disc that rotates. such devices need no power except to update. maybe a magnadoodle slice and coil(s)?
Jul 6, 2017 at 1:32 history answered Michael Karas CC BY-SA 3.0