For thousands of years, people have built so-called calendar buildings: structures that served as sundials for measuring time or were used for astronomical calculations. This photographer dedicated himself comprehensively to such buildings, in a project spanning fifteen years traveling the world in search of such sites, studying them, and recording many in striking images. His interest focused both on the architecture and its particular coding through the respective culture, as well as on the theory of photography as an allegorical image of time. Due to his premature death, the fascinating project remained unfinished and unpublished until now.