From the deeply quirky confines of Docomo's marketing department we have what could be the most environmentally friendly Rube Goldberg promotion you've ever seen.

In a recent advertisement for its Touch Wood SH-08C model phone, a handset lovingly swathed in rich, marbled wood, Docomo hired Morihiro Harano of Drill Inc. to produce a commercial set in the woods of Japan. What gives the analog-meets-digital spot its geek cred is that it was shot all in one sitting, using a series of ramps and delicate balance, showing a tiny ball playing Docomo's theme music on what turns out to be a gigantic wooden xylophone. You can check out the beauty of its simplicity in the video below.