Kuggen, an office building in Gothenburg, Sweden is coated in bold shades of red and unlike any sustainable building you’ve ever seen before. Inspired by both cog wheels and the saw-toothed edge of a leaf, the circular building was designed by Winngårdh Arkitektkontor and is composed of six floors each skewed to the south to provide shade for the floor below. A high performance facade and efficient window placement are combined with solar power on the roof as well as a moving photovoltaic shade screen on the top floor. Aiming for energy efficiency and a cool place to hang out, the office building serves the Chalmers University community and includes public meeting space and a coffee shop too.