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### Interactivity  Figures are more useful when they can interacted with an and  explored. One can think of an interactive chart figure  as giving the user the experience of playing with data, but in a very limited sandbox. Many top-tier news agencies (e. g. *The New York Times*) have done a lot of this work, and the technology is now getting easier to use without dedicated developers. Three key features of the emerging paradigm for ineractive communication of quantitative information are **Brushing**, **Linking**, and **Staging**.  * Brushing **Brushing**  is the idea of being able to select, with a box or lasso like tool, a subset of the points in a one- or two- dimensional space. * Linking **Linking**  is when data points are connected. In the context of brushing, this allows a user to explore high dimensional spaces by selecting collections of points in one dimension and determining where they lie in another dimension. * Staging **Staging**  is a storytelling tool, allowing the author to reveal or highlight parts of a figure in sequence. The highlighting can take the form of Brushing and Linking as above.