Every object, every surface has a sound, a whisper that is not detectable by the human ear. Otto (greek for ear) makes these hidden sounds audible. You can position otto to almost any surface you want. I personally haven’t a clue how a glass window or a table sounds but it would be cool to find out. Or maybe it can be used to listen through walls, you know like putting a plastic cup to you hear, that would be fun.
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