Twenty ellipses rotate around the screen center as they rhythmically bloom and contract, with each petal’s size and position shifting over time. The D3 v7 code, using `select`, `range`, and `join`, computes per-frame ellipse attributes from a time-based parameter updated via `setInterval`. Rendering as SVG animation, it employs `mapData` and `drawData` functions to dynamically set `rx`, `ry`, `cx`, `cy`, and rotation transforms for a fluid, looping visual effect.