German architect Oswald Mathias Ungers (1926–2007) accompanied his life-long architectural and theoretical production with a parallel work on found images which he would often compare to his own design proposals. Ungers collected and categorised found pictures as well as photographs of his own trips, and in 1982, he published a visual essay, introduced by a short text, called, Morphologie: City Metaphors. In the book, he conceptualised his procedure of design as a method guided by analogies and metaphors and explained how visual thinking operates. The introductory text, titled ‘Designing and Thinking in Images, Metaphors and Analogies’ had been previously published in 1976.