This example demonstrates basic SVG shapes rendered directly in an HTML page, featuring three circles and a rectangle with distinct fill colors, stroke properties, and dimensions. The visualization uses vanilla SVG markup within an `<svg>` tag, styled with CSS for the page title. It shows how geometric primitives—circles positioned by `cx` and `cy` attributes with varying radii, and a rect defined by `x`, `y`, `width`, `height`, plus stroke settings—can be composed without any JavaScript or external libraries. The code serves as a minimal foundation for building interactive React-based visualizations, as referenced in the accompanying README.