I doubt that classical music purists will like this video, but I thought it was pretty cool.

It’s a gigantically long xylophone on a wooded slope in Kyushu, Japan that is engineered so that a wooden ball rolling down it plays Bach’s that traditional Bach church hymn, “Jesu, Joy of Man’s Desiring.”

I wish it had been built just for the joy of doing it, but it turns out it was made for a Japanese phone commercial that using the tagline, “Touch Wood.” If you want to see how they put the xylophone together, look at this video

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