This example visualizes a sine wave as a row of 30 circles that oscillate vertically in sequence, creating an undulating wave pattern across a 960-by-500 SVG canvas. Each circle’s y-position is determined by a sine function whose phase shifts with time and varies with the circle’s index, producing a smooth, continuous wave animation. The code uses D3 v7’s `range` and `timer` APIs to drive the animation, updating circle positions via selection attributes. It is a direct port of a p5.js sine wave example, implemented with SVG elements and vanilla JavaScript.