This visualization displays a reordered adjacency matrix of social network data from the infect-dublin.edges file. The square grid encodes graph edges as colored cells, with node degree categorized into five groups via colors. Users can click cells to select edges, which are highlighted in red. The code uses d3.csv to load the data and reorder.js functions like `mat2graph`, `barycenter_order`, and `permute` to optimize node ordering, then renders the matrix with SVG rectangles.