A friend put this photo up on the Internet. Now suppose that, instead of showing piano keys, one would use this for advertising -- say SONY SONY SONY. It would not only advertise a product, but could provide an incentive to build, say, fences or windows at reduced cost.
OBSERVATION: Surprisingly, I find only one example of this idea on the Internet -- to promote a concept (The Invisible Man), though not to advertise directly a company or a product. I do, however, find some examples of it being used for public notices. A related invention, which I put up earlier: using road surfaces to generate tunes. Perhaps even voices, but I don't know.
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