Only Mike Tonkin and Anna Liu Can Make a (Musical) Tree

From Wikipedia:

The Singing Ringing Tree is a musical sculpture set in the landscape of the Pennines overlooking Burnley, in Lancashire.

Completed in 2006, it is part of the series of four sculptures within the Panopticons arts and regeneration project. The project "was set up to erect a series of 21st-century landmarks, or Panopticons (structures providing a comprehensive view), across East Lancashire as symbols of the renaissance of the area.

Designed by architects Mike Tonkin and Anna Liu of Tonkin Liu, the Singing Ringing Tree is "constructed from pipes of galvanised steel, which harnesses the energy of the prevailing winds", to produce a slightly discordant and penetrating choral sound covering a range of several octaves. Some of the pipes are primarily structural and aesthetic elements, while others have been "cut across their width enabling the sound". The harmonic and "singing" qualities of the tree were produced by tuning the pipes "according to their length by adding holes to the underside of each".

In 2007, the sculpture won (along with 13 other candidates) the National Award of the Royal Institute of British Architects (RIBA) for architectural excellence.