This treemap visualizes the Flare software package hierarchy, where each rectangle’s area encodes the relative size of a module (e.g., lines of code or class size). Built with D3 v3, the visualization uses nested rectangles and a categorical color scale to show the hierarchy of top-level categories like analytics, animate, data, and display, with subcategories and leaf nodes nested inside. The layout is generated using d3.layout.treemap, with each node's area proportional to its `size` value. The white borders between cells and the small sans-serif labels maintain readability, making the hierarchical structure and relative magnitudes of the Flare visualization toolkit’s codebase easy to compare at a glance. The visualization is interactive and hoverable.