The River Harp
There are 2 of these steel balls, 1 on each side of this river. They are known as the river harp. The name was inspired by the shape of the nearby bridge (you can see it in the reflection) called Ypsilon, which they thought looked like a harp.
These 2 steel balls create a sound, sound that was recorded by 15 artists in a studio. They recorded tones both high and low which they were to hold for as long as they could. So what happens is that the fluctuations from the bridge are transferred to the two steel balls and then converted into tones from the sound of their voices.
Camera: Nikon D800
Lens: Carl Zeiss Distagon T* 18 3.5 ZF.2
Exposure Time: 1/400
Focal Length: 18mm