Via utnereader:

Musical obsession of the day: world’s longest marimba (sort of) played by an autonomous wooden ball (sort of). As Geoff Manaugh of BLDGBLOG puts it: “Landscape-scale musical instruments are an unfortunately under-explored typology. We need more wave organs and forest xylophones, more Aeolian harps and conspiratorially whistling infrastructures.”

Looks like this is a promotional piece for a (Japanese?) mobile phone brand, but still cool.