Glass as Speaker Cone

In college, there was a professor who well, taught me that you can do anything, but you need to do it yourself--specifically with electronics and audio.  Anyhow, one day he took an induction driver (pretty much a speaker without a cone), and turned a wall into a speaker.  Many years later, I was reminded of Bob Bielecki's demonstration (all of them really), and decided it would be a nice solution for an upcoming project:  transmitting audio through glass!  Displayed here is a proof of concept mock-up, with gaffers tape holding the driver on instead of cold-weld adhesive.  Eagle eyes might spot a Programmable Logic Controller, a PIR, and a solid-state audio repeater/amplifier.