Thirty-three grey circles ripple across an SVG canvas, their vertical positions driven by a tangent function that shifts with an incrementing time variable. Each frame updates the circle positions and radii using D3’s data join and selection methods. The animation runs at 60 frames per second via `setInterval`, calling `vizData` to bind and update the circles. The code demonstrates dynamic visual feedback from mathematical functions, with the `makeData` generator producing coordinates and radii from trigonometric expressions.