Rajmann’s collage of selected emails published in this booklet, sparsely intercut with excerpts from Farocki’s replies, provides insight into the investigative enterprise behind Farocki’s two-channel, 16-mm installation Comparison via a Third (2007) and its cinematic version In Comparison (2009). Covering a period of over two years, the correspondence shows how the exchange between Rajmann and Farocki—and Rajmann’s various correspondence partners—gradually shapes the initial idea laid down in Farocki’s project description from January 2003: “On the basis of specific examples the construction of residential buildings will be compared.”