This interactive network graph uses D3’s force simulation to arrange a hierarchical dataset of experts and technology topics, with draggable nodes and zoom/pan support via `d3.zoom`. A button triggers a custom `switch` event that toggles the graph between a tree layout and a face-like arrangement, animating the eyebrows. Rendered as SVG elements (`circle` and `line`), the visualization demonstrates DOM manipulation with D3’s data joins and scales.