Smart Postage Stamp

In the UK the Royal Mail has launched the first 'smart stamp'. More at the BBC. It utilizes the Junaio system on a smartphone (which is required to see the effect) to see the enhanced image. Not sure I would call this a 'smart stamp', but it is the first postage stamp to use this kind of augmentation, used up to this time primarily for advertisements. I have talked about Junaio a number of times in this blog.