This example uses D3 v5 and React to build an animated, SVG-based face with eyes that shift horizontally in a looping transition. The code leverages D3 selections, SVG attribute binding via `attr`, and chained `transition().duration()` calls to alternate the eye group’s transform between two positions. The face is centered using a translated `<g>` element, with fixed constants for eye spacing, radius, and brow dimensions. Rendering relies purely on SVG shapes—circles and rectangles—without external data, focusing on animation timing and nested group transformations.