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Originally Posted by Ithekro
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So it does use ultrasonic sound, which bsically means they just added interaction by tracking a users movement in an accustical way (like bats). That does not mean the user would experience any resistance from the hologram, but still the user could interact in a certain way with it. However... the proposed applications in the article... I don't know if it is worth the technical overkill (at least not for switches... I am sure a hardware switch will less often malfunction than a virtual switch that uses a much more complex way to determine if it is on/off.. or in general... is interacting with something/someone).