This example displays a static “Hello React!” message in large centered text, with the celebrity CSV data processed but not yet visualized. The application loads celebrity records using D3’s `csv` function and attempts to nest them hierarchically by category and gender via `d3.nest`. The nested structure is recursively renamed to produce a tree-like object, though the result is only logged to the console. React renders the message as the sole visible output, with D3 v5 and React 16 handled through CDN scripts and a bundled `bundle.js`.