This scatter plot visualizes vintage car data, mapping engine size against horsepower with D3’s `scaleLinear`, `axisLeft`, and `axisBottom`. The visualization animates by cycling through four variables—car age, mileage, engine size, and horsepower—on the x-axis every two seconds using `setInterval`. Each point is rendered as an SVG circle with a fixed radius, and the chart updates the x-axis domain and circles accordingly. Data is loaded asynchronously from a CSV via `d3.csv` and parsed into numeric values.