Dr. Charles Adams Eaton, who is an instructor at the University of New Mexico, has invented the “Venturi Didgeridoo” (or “Reverse Didgeridoo”) for which a US patent 8,466,361 was granted June 18, 2013. The new didgeridoo not only manages to produce much lower tones than would normally be expected for its length, it also converts into a walking stick and a monopod camera support. Here is Dr. Eaton demonstrating the instrument and explaining how it works:
ALSO SEE : Didgerdoo players’ glottic activity – the lowdown