Four overlapping sine and cosine waves are rendered as horizontal rows of blue, crimson, turquoise, and orange circles. Each wave uses a separate D3 group and a `d3.timer` to animate the vertical positions of 50 circles per row in real time. The animation is driven by `Math.sin` and `Math.cos` functions with a shared time parameter, creating contrasting phase-shifted motion across the four color-coded sets. Circles are positioned using D3’s data join and `attr` updates, with an SVG canvas sized 960 by 500 pixels.