The world of building is changing. Frugality in energy, frugality in matter, frugality for the territory, are all issues for which urban and technical architectural solutions exist. They foreshadow the modes of living, working, feeding and moving of tomorrow necessary to eradicate global disturbances. The examples presented in this exhibition show a creative use of bio-based, geosourced and reused materials, both in rural and urban areas, and propose «arrangements» that make public spaces more attractive.