Day by day, we pass countless buildings. Sometimes we would like to know how long this or that house has been standing there. Was it built in the 50s, 70s, or perhaps the 80s? And what is the architectural style called anyway? Brutalism, High-tech, Postmodernism? Architectural historian Turit Fröbe demonstrates that it is quite easy to find answers to these questions—if you know where to look. In her guide to modern architecture, she reveals all the criteria she uses for classification, making the built environment readable. The starting point is the windows. Does the building suggest a preference for square or rectangular window formats? What materials were used: brass, tiles, or mosaic? It is very likely a building from the 50s! However, be careful: it could also be one of those many retro styles.