This volume, containing a selection of nineteen papersfrom a session at the 15th UISPP congress, tries to approach some of the building techniques, methods, and spatial organization of early architecture in Eurasia. Its goal is not to present this subject as a grand narrative of an evolutionary process of Eurasian architecture, but as a series of semiotic case studies of the building process (i.e. as studies of the geometrical forms, in two dimensions or spatial, and of the materials employed), to help the readerunderstand the importance of the materiality of the geographic formative contexts, together with the influence of social changes upon the built forms.