Navigation instructions: Mouse drag to move around, click toggles a category and shows the top-5 products from such category. Use the mouse wheel to zoom in/out. You can drag around categories to move them to other nodes in the graph, however the changes are not persistent.
This visualization is based on "D3.js Drag and Drop, Zoomable, Panning, Collapsible Tree with auto-sizing" by Rob Schmuecker from d3js.org