This example demonstrates a set of animated circles whose vertical positions and radii oscillate smoothly over time, creating a wave-like pattern across the screen. The visualization uses the D3.js library (v6.6.2) to create an SVG canvas and a custom `join` operation for incremental updates. A timer-driven loop in JavaScript updates the data every 60 frames per second, while the `makeData` function generates new values using trigonometric functions (sine and cosine) based on a time variable. The code leverages D3's `select` and `range` utilities to manage the dynamic rendering, though the circles simply move continuously without any direct user interaction.