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Joe Paradiso says he can turn almost any shop window into an interactive touch screen simply by placing microphones in the corners. The interaction expert from the MIT Media Lab says that a computer can calculate where someone is tapping on a window, corresponding to which menu 鈥渂utton鈥� they鈥檙e pressing, by measuring how long the vibration takes to reach each of the mikes. Shoppers could use it to trigger product demos or rotate displays in the window, for instance.