This example demonstrates foundational SVG shapes and styling within a React-based visualization context. It shows three vector elements on a 960×500 canvas: two circles with different fill and stroke treatments, and a thick navy line. The code uses plain SVG markup with attributes like `cx`, `cy`, `r`, `fill`, and `stroke-width` to control geometry and appearance. It highlights how basic primitives—circle and line—are composed to build visual elements, serving as a minimal introduction to SVG for data-driven graphics.