Simple demonstration: people are allowed to shine a light into one end of an optical fiber and other people view the other end to see the light. The fiber is long, so source and destination are widely separated. Maybe a bundle of fibers. People can experiment with transmitting different colors, or signals like Morse code. It is a large piece of interactive art.
The demonstration invokes the idea that the very photons you put in one end come out the other, unlike electricity (electrical signals are electrons pushing other electrons, while electron drift velocity is very slow) or water (similarly, water pushing water in front of it). (Physically, the optical effects could also be explained as waves not particles.) It also demonstrates the amazing distance that fiber optics can transmit: the glass is very clear, and total internal reflection is neat.
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