This example demonstrates how d3 and Canvas can work together for interactive visualization, showing 5,000 colored grid cells arranged in a 10x10 group layout. The code uses d3.v4 to bind data to custom DOM elements, applying sequential color scales with d3.interpolateSpectral. Rendering happens through a main canvas while a hidden canvas uses unique generated RGB colors and a color-to-node map for picking interactions. A tooltip appears on hover, and d3.timer animates cell widths during transitions, with optional React integration via VizHub.