Sergei Sitar's book "Architecture of the external world" is devoted to the analysis of the mutual conditionality of the historical destinies of European natural science and European architectural theory. and finding a way out of the systemic crisis, in which the architectural and town-planning discipline turned out to be due to the transition of natural science to the post-classical phase. The material for comparison is, on the one hand, the texts of the most influential philosophers and naturalists of different eras, and on the other hand, the treatises and manifestos that have become fundamental to the architectural profession, belonging to the pen of Vitruvius, L.. -B. Alberti, A. Averlino, K. Perrault, E. -E. Viollet-le-Duc, Le Corbusier and Ch. Jenks .