The designer always lives the doubt about the possible dichotomy between all that he represents in the project and all that, instead, will actually be realized. The doubt concerns precisely the coherence between the project, L’idée constructive en architecture (Paris: Picard, 1987), to quote the text edited by Xavier Malverti (1954 -), and the construction realized, as the ability to translate an idea represented in constructed object, that is the transformation of an intellectual process into a material object. In this sense, representation translates, defines and transforms the idea of design into graphs and models, while it is the task of the construction to transform and transpose these graphs and models into a building, into architecture. It is therefore a matter of translating a thought drawn into a real object, through a complex path where representation and constructive logic represent central moments of the planning action. And if, as Raphael Moneo (1937 -) writes, a supporter of architecture in which “what precedes is inseparable from what comes later”, architecture needs the “support of matter”, through a process that accepts, from the beginning, difficulties and compromises, which in reality the subject offers to the one who intends to use it to give completeness and concreteness to an idea, so the construction needs a design thinking that involves all the issues that will be examined during the construction: construction techniques and technologies and then, again, materials, forms and structures. A project that can be built is, in fact, a project in which technical knowledge finds expression in the constructed act, offering design solutions to the intentions of its author. This connection is increasingly narrow in that sector of architecture called “sustainable architecture” where the need for a close liaison, between materials, forms and structures, is stronger; since the relationship between architecture and building technologies, which make such a “sustainable architecture” possible, is expressed through a conscious approach to the construction and the repercussions it has on the surrounding world, according to a timeline that considers the development of time present reciprocally dependent on the future. In this short note, then, we want to present to the benevolent reader a research path in the field of “sustainable architecture” that follows one of the many paths of building with natural materials, or rather with “poor” materials, and show the process that led to the creation of a modest construction in earth-straw with the peculiarity that the supporting structure is entrusted only to the strength of the straw material, associated with the earth material, in a self-construction site assisted in the field of experimentation carried out at the Laboratory of Applied Mechanical Engineering (Lab.MAC) of the School of Architecture of Genoa (Italy).