Observation towers create a wonderful opportunity to connect with the environment, permitting a view over the treetops to incredible vistas. Many are utilitarian structures, but some are true works of art on their own. Abitare shows us this new one at a nature reserve on the Austrian River Mur, by Terrain: Loenhart & Mayr.
Abitare describes it:
Its structure is made of two polygonal helicoid stairs connecting at the top....The structure is made of a cage of black beams with rectangular section, supporting the two aluminum and steel stairs: a thick texture of rods reduces oscillations due to wind or visitors' passage. As a whole the tower is 27.5 m [90 feet] high, it weighs 87 tons and has a diameter of 8.7 m.
Looking up the center of the tower. Some other amazing observation towers with an environmental message:
Stainless Steel Tower Floats On Water
Forest Tower Has a Green Roof
See also the slideshow Terrifying and Terrific Towers