Exploration and navigation of a content collection

Provided are techniques for exploration and navigation of a content collection. A first window and a second window are created within the user interface displayed on the electronic display. A node graph visualization is displayed in the first window, wherein the node graph visualization comprises nodes representing individual content elements within the content, and wherein the nodes are clustered in proximity to each other according to topics associated with the individual content elements. A text-based topic visualization is displayed in the second window, wherein the text-based topic visualization comprises text elements representing topics associated with the individual content elements within the content. Selection is received of one or more text elements. Highlighting and zooming in is performed on a subset of nodes representing individual content elements associated with a union of the one or more text elements selected corresponding to the one or more topics of interest.