This visualization shows a scatter plot matrix of 36 pairwise combinations across 12 columns and 3 rows from a cardio dataset, with points colored by an "Outlier" quantitative field to highlight anomalous observations. Users can select data points by clicking with the Ctrl key held down, which toggles their color to red across all plots via a union resolution selection parameter. The code uses the vega-lite-api library to define the repeat-based matrix, d3.csv for data loading, and panzoom for zooming and panning the entire chart surface.