Aeolus

Aeolus - Greek god of the four winds, is an acoustic and interactive sculpture that sings with the wind, resonating without power or amplification by Luke Jerram.

Aeolus is an acoustic and optical pavilion designed to resonate and sing in the wind with no electrical power or amplification - a giant Aeolian harp. Through vibrations in harp strings attached to some of the tubes the artwork sings in the wind. The tubes also hum at a series of low frequencies and as they are mirrored internally, they draw the surrounding visual landscape into the artwork, creating a kaleidoscopic effect for the viewer standing beneath the arch.
Place your ear to any of the tubes on the outside of the sculpture and you will hear a different low note from each one, like a musical scale.
Stand beneath the arch and you will hear the sculpture 'sing' when the strings attached at the top vibrate in the breeze, like the strings of a musical instrument or stand in the exact centre of the arch, make a sound and your voice will reflect and an echo heard.
From inside the sculpture, peer down the tubes and you see reflections of the surrounding buildings and landscape, giving familiar sights a different perspective.
http://www.lukejerram.com/aeolus