An animated SVG visualization of swirling geometric patterns, demonstrating dynamic data binding with D3 selections. Hundreds of teal lines and rainbow-colored circles continuously update their positions and radii in a dark viewport, creating a rhythmic, organic motion. The code uses D3 version 7’s `select` and `selectAll` APIs with a `join` method to handle enter, update, and exit states for both line and circle elements. Data is generated procedurally via custom `makeData` and `vizData` functions, using trigonometric calculations and `interpolateRainbow` for color mapping, with updates triggered by a JavaScript `setInterval` loop.