A force-directed network tree shows Mickey Mouse as the central node connected to Minnie, Clarabelle Cow, Scrooge McDuck, Ludwig Von, and Mortimer Mouse, with link thickness scaled by the `weight` attribute. The D3 v4 code uses `d3.layout.force()` to simulate physics, rendering nodes as pink circles with green labels in an SVG canvas. The data is loaded from `graphFile.json`, and nodes are draggable via `force.drag()` while links update position on each tick event.