Michael Rosen is a British children's author and poet whose expressive readings and YouTube videos have been widely clipped and shared as memes. Fans began lifting his short, upbeat reactions, including this approving Nice, and reusing them as quick responses in edits, streams and comment sections. Because the delivery is warm, clear and instantly recognisable, it travelled beyond his original audience and became a handy shorthand for approval. It remains popular because it says a lot in under two seconds, without needing any setup or explanation.