This matrix visualization displays email communication patterns within the Enron dataset, using color intensity to represent average sentiment between sender-recipient pairs. The adjacency matrix shows all employees on both axes, with cells colored from yellow through white to blue based on sentiment scores. Built with D3 v4 and React, the code uses `d3.nest()` to aggregate emails by sender and recipient, `d3.scaleLinear` for sentiment coloring, and `d3.zoom` for interactive panning. Employee job titles are encoded through axis label colors using a categorical scale, with the SVG rendered client-side.