When I saw this the first time (last week) I failed to notice that it was an actual working product, and that he had given the entire design publicly, for anyone to build and use.<p>As a sighted person, I don't have much use for it, but I think it would be interesting to see it in action.<p>The fact that it's built on an Arduino also means that anyone with an idea can hack up a new version of it and try their idea. Amazing.