The sound a mechanical typewriter makes when being heavily used could be very annoying or reassuring, depending on context.I wrote a lot on manual typewriters. If this jammed and made too much noise it might be okay.I remember hearing typing on a manual once and it really annoyed me. I certainly did enough myself, in apartments. I wonder if my neighbors hated me.You could actually feel it in your feet. You had to hit each key solidly or risk backing up and hitting it again. I wonder if good ribbons were wool?
Speed Typing Test (Halda Star Typewriter)
I found the above video right off, but then I found this video, which mentions ASMR, and when I look that up, I found this one:
ASMR 10 Triggers to Help You Sleep
I use a Dell plastic keyboard. I tried being particular about my keyboard once, but then I got pulled out of my cocoon and had to use some other random keyboard and it was so disturbing that I forswore all custom keyboard input schemes.