Yesterday I stumbled upon an interesting percussion instrument:
(Instrument at 3:28 of the video)
The instrument takes the form of an oblong wooden block with 12 small round holes (6 at each far end, spaced evenly along the smaller width) connected by some sort of cut-out-trenches in a more or less aestethic manner. It seems to be played the same way a xylophon is played, the trenches/barriers likely modifying the way vibrations propagate, thus modulating the eventual sound.
quick screen-grab...
