Public sculpture makes wonderful sound when gravel is dumped into it

I love the sound that this public sculpture makes when gravel is poured into it.

At a glance, it seems like it would be easy to walk by this sculpture without realizing it's capable of a fun trick. 

When gravel is poured into the middle of it, the gravel bounces along small metal sticks and makes a sound like a windchime, but even better. I wish these contraptions were more commonplace, because I love the noise it makes.

See also: Machine with wishbone is a moving sculpture