A lifelong fan of London, German photographer Wolfgang Strassl captures tube passengers for his latest photo book, Underground Portraits (Kerber Verlag). Strassl believes that “what we see in faces is largely our own projection”, so shoots each person’s overall appearance, without their heads. The images invite viewers to scrutinise the “conscious and unconscious messages” conveyed by clothes and body language, while showing the diversity of people coexisting on the tube. “London is probably the world’s most cosmopolitan city,” says Strassl, “and the underground its most democratic social space.”