This example shows a dynamic scatterplot of circles that oscillate vertically and change radius over time, driven by sinusoidal functions of their index and a continuously incrementing time variable. The visualization renders in SVG using D3 version 7, with a `selection.join()` pattern to update circle positions and radii every frame via `setInterval`. The data is generated procedurally by `makeData`, producing a smooth, wave-like motion across ten to fifteen elements while `vizData` binds and updates the SVG attributes.