when he started describing how it worked, and how the airjet drew in its own air to amplify the output, i INSTANTLY thought of the basic idea behind a turbocharger and how you can actually make small jet engines out of them.
Looking into it, its the same concept, just in a pretty shape.
http://farm3.static.flickr.com/2590/4006673534_770076e730_o.jpg
A cool way to see how this works yourself is see how much you can blow up a large bag with your mouth right up to the bag, versus blowing into the bag from 6-12 inches away.