The only one that I heard of which "worked" is this one in South Korea. Pretty innovative really! http://www.innovationexcellence.com/blog/2012/10/29/koreas-em

The only one that I heard of which "worked" is this one in South Korea. Pretty innovative really! http://www.innovationexcellence.com/blog/2012/10/29/koreas-emart-revives-sundial-in-the-age-of-qr-codes/ http://www.innovationexcellence.com/blog/2012/10/29/koreas-e...