This example constructs a simple smiley face using SVG circle elements, with a yellow head, black outline, and two dark eyes positioned symmetrically. The code directly sets coordinates and radii for each circle within an SVG canvas. It includes a force-directed graph implementation using `d3.forceSimulation` with link and charge forces, rendering nodes as draggable steelblue circles connected by gray lines. The visualization demonstrates basic SVG shape styling alongside interactive D3 drag behavior and simulation tick updates.