I really appreciate the bit in this Tech Connections video about "the lost art of projection"
back in the mid-2000s I worked at my local theater as a projectionist, and as digital has largely replaced 35mm film, it's a precise hands-on skillset that's basically gone
you really felt like a niche professional, walking around in that dark, hot concrete hallway upstairs above all the movie-goers, carefully threading and timing 14+ giant complex mechanical machines within a minute-tolerance of a constant schedule
easily the most satisfying skill I've performed with my hands as a job, you could really feel yourself improving threading speed, improving building speed and making cleaner splices, caring more than anyone else in the building about framing and volume and creating a good film experience
I used to work at a little demi-arthouse theater back in CT that was one of the longer holdouts of traditional projectors in the area and I still remember the day seeing them get packed up and wheeled away as the theater eventually switched to digital ones, I was heartbroken. Lost a cool authentic touch for effectively a bunch of big blu-ray players.
