4. data-ink ratio = data-ink total ink used to print the graphic = proportion of a graphic’s ink devoted to the non-redundant display of data = 1 – proportion of graphic that can be erased
5. 2 1 3 5 4 6 source: The Visual Display of Quantitative Information by Edward R. Tufte
6. 1 2 need grid? make it lighter source: train schedule by E.J. Marey
34. books The Visual Display of Quantitative Information Envisioning Information Visual Explanations Information Visualization Information Dashboard Design Beautiful Evidence