One of the educational by-products of German botanical scholarship was the publication of sets of large ‘wall diagrams’ (Wandtafeln) for use in the lecture-room. Most British University Departments of Botany dating from the period before the first world war probably had at least one of these sets. In my own department I have used these excellent diagrams occasionally, realizing that they combined clarity, size and accuracy to an unrivalled extent. This passage from a recent essay by S. M. Walters forms an appropriate introduction to the topic of this paper. From the start, it should be noticed that the use of such diagrams (referred to as ‘wallcharts’ in the rest of the paper) was by no means limited to botany nor to university studies. As will become clear, they were one of the most important media for the teaching and learning at different levels of education and within different fields.