Most modern exploratory visualization environments (see Table xx for examples) are interactive, and, as a result, users can create a wide variety of different (and often temporary) visualizations (for an example, see Figure 2). The on-the-fly nature of exploratory visualization often makes software recommendations (such as color palettes and visualization options) even more important. The non-expert user most likely will use the software defaults, but visualization experts agree that the defaults are hardly ever the best option (Driscoll, 2010; Goodsell, 2006; Healy & Moody, 2014). A default may be appropriate or pleasing in a narrow range of circumstances, but not usually broadly.