This example shows a grid of nine identical pairs of faces, each composed of two overlapping SVG faces with different mouth orientations. Built with React and D3.js v7, the code uses the `arc()` API to generate mouth paths, with one face rendering a downward arc and the other an upward arc. The faces are positioned using a `FaceContainer` that translates the SVG group to a center point, while `range(9)` from D3 creates the repeated array. All rendering is done through SVG elements defined in separate component files.