Text description provided by the architects. How to build sustainability? A very current question - that moves a lot of people, as well as Master students of the course „DESIGN and MAKE sustainably“ guided by Prof. Dr. Rainer Hirth at Coburg University of Applied Sciences and Arts. The project started with a number of seminars about problems coming from the building sector. According to a UN report from 2020, the construction sector is responsible for 38 % of all CO2 emissions globally; for an immense and constantly growing consumption of resources, and, for example, in Germany for around 55 % of all waste. The constantly increasing demand for living space per capita - the average is currently 48 sqm in Germany - eliminates all progress in sustainability through the rebound effect. And is everything correct what we calculate in terms of energy consumption etc.?