This example demonstrates an animated sine wave generated from a dynamic dataset, rendered as a set of circles that move vertically across the screen. The number of points fluctuates over time, creating a breathing effect. The visualization uses D3’s `select` and `selectAll` APIs to manage an SVG canvas, updating circle positions via the data join. Data is produced by `makeData.js`, while a 60Hz interval drives the animation, and `vizData` handles the rendering. The code relies on the `d3.range` function for data generation and D3’s SVG circle elements for display.