C5 is a research center of convergence science in POSTECH (Pohang University of Science and Technology in Pohang, South Korea). The main concept of the project was to link between science study and the space through visual languages. For visualizing "Convergence Science," two grids overlapped in 45° were used for the graphic module, which generates regularity line and irregularity space. Letter forms and graphic elements have been designed from this system, and it covers other application forms such as way finding, façade graphic and solid form.