The clic system modular architecture system was designed in 1995 by the Stuttgart designer and entrepreneur Burkhardt Leitner. Since then, this iconic modular construction based on magnetic plug connections has developed into one of the most successful flexible lightweight construction systems in the field of trade fair and exhibition architecture. In this issue of the form Design Classics Series, author Georg Vrachliotis deals with the high functionality, modularity, and minimalist aesthetics of this modern design classic. He also deals with the cultural history of systems and sheds light on the design-historical context of the clic system.