This example visualizes a dynamic wave pattern of 40 circles and connecting lines that oscillate vertically and change size over time. The circles and lines move in a sine-wave formation, with their positions and widths updating continuously to create a flowing, animated effect. The code uses D3.js version 6.6.1 with the `select`, `range`, and `join` APIs to efficiently update SVG elements, and runs an animation loop at 60 frames per second via `setInterval`. The chart renders entirely in SVG with no external data source, purely generated from mathematical functions.