[glossyscr]

My dad had an IBM Selectric typewriter with a typeball head. I remember I was 9 or 10 and it was so satisfying how a soft key press let the typeball moving & rotating incredibly fast to the right letter and hammering the paper. Actually it was so fast you barely could see any movement. The printed letters were ultra crisp and clear (like a today's 2400dpi b/w laser printer) since it was kind of an one time ribbon. A total different experience to previous typewriters where you needed to hit the keys hard and the printed letters were of inconsistent quality.

Since then I was fascinated by devices with keyboards.

I found a commercial where you can see the typeball in action including slow motion: https://www.youtube.com/watch?v=vNUEUth7qjc