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Among other bits in IDFuel's office privacy round-up is this device called 'Babble' from Herman Miller, designed to add masking human noise to hide the contents of your conversations from nosey office mates. The Babble takes your own conversation clips and spits them back out at random, making it hard to track your actual, current conversation, and serving as an aural clue that your coworkers should pay extra attention to your next words.

Building Real Privacy [IDFuel]