Context-preserving visual links are lines that connect items in a visualization or set of related visualizations to highlight those items and thus make them easier to find, and do so in a way that minimally occludes other information. There are many ways that items can be highlighted. The best methods apply visual attributes to those items that we perceive preattentively, causing them to pop out in the display. This approach highlights items without adding meaningless visual content to the display. As you can see in the following example of context-preserving visual links, items are highlighted by the addition of lines to connect them.