This example visualizes the differences between color interpolation methods by comparing splines in L\*a\*b\* color space to a direct linear interpolation. A horizontal canvas strip renders a gradient produced using `d3.interpolateBasis` on L\*a\*b\* channels, while an SVG chart plots the individual L, a, and b channel curves as both smooth basis splines and dashed linear segments. The code uses d3.lab, d3.interpolateBasis, and d3.line, with circular swatches showing the original PiYG palette colors at corresponding positions along the x-axis.