The guitar pictured above is a headless hollow instrument which uses a knot in the wood to form the soundhole. Called the Rhino, it is one of a number of guitars built by artist Jeffrey Schreckengost. You'll see if you click through on that link that he's built some other weird and wonderfully eccentric guitars including a shortscale 2-string fretless bass and a five-string baritone guitar.
The Rhino was built for David Kuzy, guitarist of noise rock ensemble Microwaves, who says about the guitar:
"I think the dark wood is walnut. The lighter wood looks like mahogany, but I am not sure. The neck came from a Squier Tele that I bought at a flea market.Thanks for sharing that with us, David. It's just the sort of oddball instrument that we enjoy looking at here at Guitarz.
"The fit and finish isn't as nice as some fancier guitars I own (Teuffel/Scott French) but it is definitely playable and a lot of fun. There is no volume control, just a momentary on/off switch.
"I didn't know this guitar was being built for me, I went to an art opening Jeff has with his wife, featuring his guitars and her photos, and he told me he was giving it to him in return for a bunch of random parts I had given him over the years."
G L Wilson
Guitarz - The Original Guitar Blog - now in its 9th year!