
This does not have to be tag based, something as simple as a motion sensor has been tested in the past. An example of this was in operation with Shampoos in 2003 when we visited Metro's Extra 'future store'. (see picture) It was quite effective. This test takes it beyond the public future store. There is an inherent spookiness in such systems, and their copy and sensitivity has to be carefully designed. Mentioned in the WSJ, link in article.
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