Circles colored in five shades bounce across a 1050×1500 canvas, colliding and repelling while remaining within invisible boundaries. The visualization mixes two rendering systems: hundreds of smaller background molecules draw to a Canvas element, while twenty larger, interactive particles render as SVG circles. Both sets move through a shared quadtree-based collision detection routine in `map.updatePositions`, which adjusts positions and enforces edge bounds. A `d3.timer` loop continuously updates particle coordinates and redraws both the Canvas buffer and the SVG group, whose circles use `transform` attributes for translation.