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Stores can track you down to give you directions to an item you've expressed interest in. But again, so can others.
Stores of the future will feature <a href="http://www.zdnet.com/blog/gadgetreviews/ces-2010-intel-ceo-otellini-shows-off-holographic-glass-display-multipoint-smartphone-videoconferencing/10922">interactive holographic images</a>. Are you watching them or are they watching you?
Another new tracking method designed to encourage retail buying is the use of visual devices that will scan the potential customer's face to determine whether they are pleased or not. If they don't look particularly pleased, then the store will attempt to interest the customer in something else.