This is called, 'The Singing Ringing Tree', a public Art work commissioned by Burnley CC, overlooking the Pennines in Lancashire.
I think that this is a beautiful example of a land sculpture,making the environment integral to the work - in this instance the wind. Designed by architects Mike Tonkin and Anna Liu of Tonkin Liu.
There is another one which I came across, where the wind is used to create sound and this is equally as beautiful.
This one is called 'The Sea organ of Zadar, created by award winning architect Nikola Basic in 2005.
