The catalog documents the creative activity of architects Bohdan Lachert and Józef Szanajca in the interwar and post-war period, when Lachert after Szanajca's death continued the idea of ​​a professional duo. The collection includes architectural designs, drawings and sketches, spatial models, copies of projects, watercolors, photographs and photomontages, sgraffita, patents and prototypes of furniture, sculpture and architectural and sculptural concepts, descriptions of spatial concepts referring to the viewer's imagination, program and journalistic texts, diagrams illustrating the creative process of the architect, theoretical dissertations on the psychology of vision, as well as exhibition scenarios, diaries and photographs. The catalog covers the years 1922-1984, contains 281 items, includes over 1,500 projects and 300 illustrations. It has been enriched with biograms of the architects, an essay devoted to the original character of the studio's work and an anthology of 30 texts on architecture by Bohdan Lachert, Irena Lachert (the architect's wife) and Józef Szanajcy.