This example demonstrates a generative animation of circles that smoothly undulate across the screen, with each circle's position and radius oscillating over time. Built using the D3.js library, the visualization runs a continuous loop at 60 frames per second, recomputing the dataset based on a sine wave that controls both the number of circles and their lateral and vertical movement. The rendering relies on D3's selection and join API to update `<circle>` SVG elements, while the data is generated by a custom `makeData` function.