This example demonstrates basic SVG shape creation and animation within a React scaffold. It draws a yellow face with circles for eyes, rectangles for eyebrows, and an arc for a mouth on a grey background, using D3 v5 selection and shape generators like `arc`. The eyebrows move up and down via chained `transition` calls with a duration of 800 milliseconds each, while hand-coded SVG elements for circles and rectangles appear in the HTML alongside programmatically appended ones.