Ran across a reference to this while poking around on IDEO's website. This London cafe -- charmingly named "Tina, We Salute You" -- uses the wall by their coffee machine to keep track of how many coffees their loyal customers have bought. Buy 10, get one free.
In addition to serving a useful (and loyalty-promoting) function, it also strikes me as a cool, evolving work of art. Kinda makes me want to write on my own walls!
Sep 29, 2010
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