At first glance, the three-legged stool looks light and elastic due to its inflated shape. However, this external appearance is deceptive. Made of sheet steel, it weighs about 3 kilograms and is only 1 millimeter thick. The fact that the stool has been inflated, on the other hand, is no deception. The FIDU (Free Internal Pressure Forming) technique used for this was developed by architect and designer Oskar Zieta together with his colleague Philipp Dohmen: two 0.8 millimeter thick steel sheets are laid on top of each other, welded together at the edges and then inflated under high air pressure. This innovative shaping process makes it possible to create three-dimensional objects from two-dimensional surfaces in a short time.