A grid of circles animates across an SVG canvas, moving horizontally in a staggered wave. Each circle cycles through a sequence of horizontal positions, creating a looping motion synchronized by a per-circle delay. The fill color transitions from pale yellow to dark navy based on the circle’s index, using a linear scale with HCL interpolation. The animation is built with D3 v4’s `transition` and `d3.active`, while a separate module loads car data via a Promise and formats it with template literals.