This visualization displays the Old Faithful dataset as a grid of small multiples, each a binned heatmap that compares one of three eruption duration variables (rows) against one of six waiting time variables (columns). The code uses the Vega-Lite API to construct the repeated chart specifications, with vegaEmbed handling rendering. It computes bin counts from the data and colors rectangles by frequency using a greens scheme, drawing from a remote CSV file.