A scatterplot matrix displays correlations between physical measurements of abalone, with cells colored from pink to steel blue based on positive or negative correlation strength. Users select a sex category (Male, Female, Infant) from a dropdown menu to update the matrix for that subset. The visualization uses d3.scaleLinear for color mapping, d3.scaleBand for axes, and renders as SVG with correlation values labeled in each cell. A color legend bar on the right uses d3.axisRight. The data comes from the `abalone.data` file.