This visualization displays a correlation matrix for the mtcars dataset, using both numeric labels and scaled circles to represent correlation coefficients between variables. The lower triangle shows values as text while the upper triangle uses circles whose radius encodes magnitude, with a diverging color scale from red to white to navy mapping correlations from -1 to 1. Built with D3 v3, the SVG renderer positions cells using ordinal scales and includes a color legend constructed from small rectangles. The data comes from a CSV file containing precomputed correlation values.