Air consists of the lightest substances in the world, the presence of which can only be felt through changes in pressure and the resulting air movements, such as the wind. Air can be set in motion, lifted, compressed, divided, heated or cooled almost effortlessly. It is omnipresent and available in large quantities. In the course of evolution, many organisms have learnt to use this medium for various purposes. Birds use it to support their wings in flight. Some marine animals use it to float. Through "trial and error" or targeted technical development, mankind has also learnt to use the unique properties of air in various technologies. The most common example in construction is its special insulating properties. In the seminar, we will familiarise ourselves with and explore the mechanical properties of air in its application in the construction industry. The focus will be on pneumatic structures and their load-bearing capabilities. Participants will work in groups to prepare and present short papers on selected aspects of the use of air in construction. The knowledge gained through the research will help the participants to realise the specific details in the design of "Building with Air".