It’s the ebow, which is this thing here.http://www.ebow.com Lots of people like to mess with it on electric guitar,
which is what it was made for I guess, but there’s some nice stuff on acoustic as well, like this video. Or this one here. Finally, here’s some noodling I did on electric, remember I’ve had the thing for all of about five hours. I try to imitate a berimbau at one point, only partially successfully, it needs more buzz. I suck at guitar and I really suck at moving around on single strings, so hey, more stuff to learn. Woo!