'Primeval architecture is an architecture of necessity. Nothing is there to excess, no matter whether stone, clay, reeds or wood, animal skins or hair are used. It is minimal. It can be very beautiful even amidst poverty and is good in the ethical sense. Good architecture seems to be more important than beautiful architecture. Beautiful architecture is not necessarily good. Only buildings that are at the same time ethically good and aesthetically beautiful are worth preserving. We have too many buildings that have become useless and yet we still need new buildings, from pole to pole, in the cold and in the heat. Man's present areas of settlement are the new ecological system in which technology is indispensable, even in hot and cold areas. Our age requires buildings that are lighter, more energysaving, more mobile and more adaptable, in brief more natural, without disregarding the need for safety and security. This logically leads to the further development of light constructions, to the building of tents, shells, awnings and air-supported membranes. It also leads to a new mobility and changeability. A new understanding of nature is forming under one aspect of high performance form (also called >classical form<), which unites aesthetic and ethical viewpoints. Tomorrow's architecture will again be minimal architecture, an architecture of the self-education and selfoptimization processes suggested by human beings.' (Frei Otto and Bodo Rasch in their foreword of this book.) In 1992 the Bavarian branch of the Deutscher Werkbund awarded its first prize to Frei Otto, undoubtedly the most successful and many-sided protagonist of modern light construction, and with it a request to nominate a meritorious person to whom the prize could be passed on, and to design a joint exhibition with that person. Frei Otto chose his pupil Bodo Rasch, who had realized Otto's theories particularly in other cultures. Otto died on 9 March 2015; he was to be publicly announced as the winner of the 2015 Pritzker Prize on 23 March, but his death meant the committee announced his award on 10 March. Otto himself had been told earlier that he had won the prize by the executive director of the Pritzker Prize, Martha Thorne. He was reported to have said: 'I have never done anything to gain this prize. Prize winning is not the goal of my life. I try to help poor people, but what shall I say here I am very happy.'