In Europe, chestnuts are just coming in to season. Delicious chestnuts just in time to be roasted over an open fire. But Bund, a German group that advocates for trees sees chestnuts as musical instruments.
They installed a device beneath a chestnut tree so that every chestnut that falls triggers music and sound. The chestnut tree is in Monbijoupark in Berlin and visitors can donate money to the association via SMS or text message.
Website: Paper Plane