The X House project aims to solve by the definition of a system, language, or even through a unique form, a number of inquiries that rise up when we read the specific given site: how to protect and give protagonism to an impressive pine, that is located on the top of the site, and that makes access and approximation to the house extremely complex from the street; how to avoid deciding between the views to the sea and those to the mountains, and allow both visions in opposite directions; how to neutralize through form the presence of the contiguous constructions, to build up a fake isolation that denies the neighbours; how to double the main views, permitting quality frontal views from the front and the rear of the house; how to resolve so many a priories with a simple movement that answers to all of the previous aims without prioritizing nor explicitly formulating a response to any of them. The form, a unique form, is the result of a long process of search of individual answers to each of those challenges; thus, the form is not an a priori, but an effort to give a unitary response that satisfies each of the questions rose up in the design process.