When someone talks about sustainability in case of architecture it should not be just about insulation or a very effective and environmentally friendly building. The word sustainability includes the sense of future, responsible thinking and the overall well being, the life quality of the human race which is not just about values and measurements. It is also very much about having a balance in our life, living a lifestyle which makes us happy, socially active and satisfied in every possible way. It is the task of this architectural project to find the comfort zone not just in the sense of degrees and energy demands but also of feelings and emotions. The book guides you through the design process of a building in the Mediterranean, on the magical island of Hydra where there are no cars, no stress or pressure and where one could experience the calmness of the "prefossil" age. This diary could be useful to anyone who is interested in sustainability, either being an architect, a student or simply a curious person. It can help to figure out which tools and methods should be used to design a buliding (and a way of life) for a better tomorrow.