Hi Alun,
Being able to get wifi or mobile signal where you want people to get information is still the biggest problem in many areas of the country.
I'm not convinced that QR codes will still be here in 10 years' time but they are being used on gravestones so maybe there will be enough vested interest to keep them going. I'd suggested mosaic to someone a couple of years ago who was very keen on using them in a garden.
Most of the examples of QR codes on gravestones seem to be small steel plaques with it printed on, or engraving + painting, but I've seen examples of some carved that seem not to use paint eg http://www.irishexaminer.com/ireland/codes-carved-in-stone-tell-tale-of-deceased-208617.html - and they could be in patterns other than squares such as the cross example on http://www.stone-ideas.com/2012/06/01/art-an-angel-with-a-mobile-phone-and-qr-codes-for-gravestones/ .
Personally, I'd prefer to have software that uses GPS & image recognition but there's still little sign that enough people agree with me on that.
Janet
Janet E Davis
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