Identify a contemporary use of this idea other than the obsolete one of television tubes where the image you see is created by a beam inside the tube. For this, it is fine to search the web or ask others for ideas, but please make the answer your own and cite your references in your response. If someone wants to try "ChatGPT" and see what it says that would be interesting for everyone to know. If you do$,$ tell us$,$ and critique whether it is correct or in what ways it is incomplete. Be aware that both Al tools often hallucinate answers and invent citations, so do not rely on them to be truthful.