Cognitive and Practical Value A chart of charts functions as both reference and pedagogy. For students and practitioners, it is a rapid orientation to the repertoire of visual encodings: when you need to show correlation, reach for a scatterplot; for composition and parts of a whole, consider stacked bars or treemaps; to narrate change over time, a line or slopegraph might be best. Shimizu’s taxonomy helps reduce cognitive load by clustering charts by problem type and showing trade-offs—simplicity versus precision, density versus clarity. For designers, it’s a prompt to invent variants or hybrids that address domain-specific constraints (e.g., small multiples for many comparable series, or violin plots for distribution nuances).