Abstract: The navigational display of hierarchically structured data, including elements contained within constructs, is disclosed. A center node is displayed as one of the elements or constructs. The center node has as first-level nodes elements and/or constructs that are contained within and/or contain the center node. The first-level nodes are displayed within a concentric ring around the center node, and spokes are displayed between the center node and the first-level nodes. The first-level nodes may each have as second-level nodes those of the elements and/or the constructs that are contained within and/or contain the first-level node. The second-level nodes of such first-level nodes are displayed within another concentric ring around the center node. Spokes are displayed between each of these first-level nodes and the second-level nodes of the first-level node. A user may navigate within the display of the data, including zooming, panning, rotating, and expanding and collapsing the data displayed.