Mechanical Trees

I recently posted a picture of these stainless steel tubes which sit on top of the pavilion building at the new City Park. At the time I thought they were purely an artwork, but apparently they serve a dual purpose. The tubes represent mechanical trees, the perforations at the top are derived from a pixelated image of the sessile oak trees which sit alongside, and the main purpose of the tubes, exhaust vents for the public toilets beneath! My thanks to James at Sturgeon North for the information.