For years, a friend of mine (in San Francisco) and I (in New York City) have sent one another an image [1] of one of these being tuned any time we’re doing coas

For years, a friend of mine (in San Francisco) and I (in New York City) have sent one another an image [1] of one of these being tuned any time we’re doing coast-to-coast software debugging (especially relevant when we were working on a realtime collaborative text editor). [1] https://www.loc.gov/item/2014714519/ https://www.loc.gov/item/2014714519/