1. A system for data presentation, comprising: a processing device; a sorting component that is operable by the processing device, the sorting component being configured to determine categories relating to one or more data items for display on a display device, wherein the data items are structured within a hierarchical folder structure; and a cluster component that is operable by the processing device, the cluster component being configured to facilitate grouping the categories according to discretized states, wherein the discretized states are a property which is assigned to each grouped category via the cluster component, to control visible output to the display device, and wherein the discretized states include a packed state that, when assigned, causes grouped data items from multiple different folders in a grouped category to be displayed as one icon that represents the grouped data items in the grouped category to which the packed state is assigned, and an unpacked state that, when assigned, causes each data item in the grouped category to be displayed as one icon that represents the grouped category in a tree display and as individual icons when viewed in a contents display, wherein the grouped data items are displayed as a union with other items from a particular folder of the multiple different folders when viewed in the contents displayed with respect to the particular folder.