Three semi-transparent circles overlap on a dark SVG canvas, with brown, steelblue, and green fills at 50% opacity. The circles are positioned so their intersections create blended secondary colors, demonstrating basic transparency and layering effects. The visualization uses D3.js v3 to append SVG circle elements directly to the document body, with fixed pixel coordinates for the center points and radii. The rendering is entirely client-side, with no external data source, and the geometric composition is hardcoded in the script.