Learn in the textbookCross-Tabulation and Advanced Visualization of Correlation
DefinitionA mosaic plot (モザイク図) turns the counts of a cross-tabulation table into rectangle areas to show the proportions within each group.
ExplanationFirst, set the widths according to the share of each category of one item. Next, cut each width vertically according to the shares of the other item. Because each tile's area is proportional to its cell's count, one figure shows both the size of each group and how their breakdowns differ.
AnalogyIt is like snapping a chocolate bar vertically by the share of people, then snapping each piece horizontally by its breakdown, so the size of each small piece stands for a number of people.
Memory hookLike a mosaic artwork, rectangular tiles of different sizes fit together into one picture.