This example demonstrates the foundational SVG shape elements used in data visualization, showing a single small circle rendered on a blank canvas. The code uses the native SVG `<circle>` element with explicit `cx`, `cy`, and `r` attributes to position and size the mark. The visualization is rendered directly in the browser through inline SVG markup within an HTML document, with no additional JavaScript libraries or data binding involved. It serves as a minimal starting point for understanding how geometric primitives form the basis of more complex chart constructions.