This visualization shows a series of circles connected by a line, forming a bouncy wave that oscillates across the screen. The data is generated procedurally in `makeData.js` using math functions, with each circle’s position and radius varying over time. The rendering uses D3’s `select` and `join` methods to update SVG circle and path elements in an animation loop driven by `setInterval`. D3’s `line` generator creates the connecting path, while the group element is harnessed to organize the circle data efficiently.