TOS debuted when I was 15. One of the most fascinating things about it for me was the Enterprise miniature shots, because I didn't know how they were done. They weren't on wires, like Buck Rogers, Republic serials, Lost in Space, or Forbidden Planet. They weren't animated cartoons. So I started reading about special effects cinematography, miniatures, optical printing, and bluescreen/chromakey. Of course now I can get similar effects with my computer software. But well done bluescreen, as Star Trek often was, still fascinates me more than CGI.