The study examines the modes of representation and communication of information through illustrative teaching aids in the 19th century. It focuses primarily on the didactic wall paintings and the tradition of lectures with slides and notes, how could the experience of these types of collectively observed images influence impressions and expectations of early film audiences. Didactic images are here analyzed primarily in terms of their compositional features, but in an effort to explain how processuality penetrated into the didactic image of the 19th century also with regard to the aspect of time. As a result, the study calls for a reassessment of the importance of the didactic wall painting in the formation of modern visuality and observati...