This example demonstrates how `d3.scaleQuantize()` maps a continuous numeric input domain to discrete output ranges, using it to assign fill colors to a series of rectangles. The visualization renders 100 SVG rectangles, positioned with a `d3.scaleLinear()` scale and colored with a quantize scale that divides the domain [0, 100] into four color bands: lightblue, orange, lightgreen, and pink. The code uses D3 v7’s `join()` method to bind data from `d3.range()` and style each rectangle’s fill based on its value.