This animated map of Belgium visualizes the number of emergency calls per municipality over time using D3 v7. Fake CSV data is filtered by timestamp and displayed as expanding and contracting bubbles on an SVG map rendered with `d3.geoMercator` and `d3.geoPath`, using a TopoJSON topology. A retro-style digital clock, built with animated text and a clipping mask, indicates the current time step, while a legend shows the bubble scale.