There's the link:
http://www.engadget.com/2013/10/14/delta-six-gun-controller-final-version/
And there's the YouTube video:
http://www.youtube.com/watch?v=oTNGnM0k1lQ
And there's a picture of a doorknob shaped like a hand. Don't ask, I'm tired and I'm too lazy to make up a good excuse right now...
http://rossotron.com/wp/wp-content/uploads/doorknob.jpg