This example shows a smiling face built with React and D3, rendered as SVG shapes. The code combines React’s component model with D3’s `arc` generator to draw the mouth as a path, while circles define the face, eyes, and stroke. It uses fixed numeric constants for dimensions and positioning, and renders the entire composition inside a single SVG element. The example demonstrates an idiomatic hybrid approach where D3 handles geometry generation and React manages the DOM updates.