Singing Ringing Tree, by Architects Mike Tonkin and Anna Liu

Harnessing nature’s music

GrabbySite

The Singing Ringing Tree is a wind powered sound sculpture resembling a tree set in the landscape of the Pennine hill range in Lancashire, England. The 3-metre tall construction comprising pipes of galvanised steel harnesses the energy of the wind to produce a penetrating choral sound covering a range of several octaves.

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Michael Grab’s Cairn Sculptures: Beauties in Balance

Cairn: noun \ˈkern\ A pile of stones that marks a place (such as the place where someone is buried or a battle took place) or that shows the direction of a trail.

via Balancing Act — My OBT (which shows a good number of amazing images documenting these works.)