Fifty circles with randomized positions and radii are rendered as an SVG. The visualization demonstrates a multi-force physics simulation where a force-based layout continuously attracts the circles toward the current mouse location while a separate collision force keeps them from overlapping. The example uses `d3.forceSimulation()` and `d3.forceAttract()` from the d3-force-attract library, with per-node attract strength defined via the `inertia` property. A mouse-move event updates the attract target and restarts the simulation, updating circle positions on each tick.