PWK And Jim Build The BIG Foam Horn

Jim Hunter Klipsch engineer and historian posted this great pic on the Klipsch site. Not sure what is going on here but that is a big plywood and foam horn. I'd like to see a better pic and get more of the story.

Jim and Hunter are rather tall guy's so this horn should be large 6ft-8ft x 6ft-8ft. I'd like to see more of these experimental fun horns they built.