I started reading the article with a feeling of "I don't recognize this at all" from the first few images that slowly loaded.

Then we got to the metal plates in elevators and the other uses, and my brain immediately turned around and said "Of course you know this; you've seen this a hundred thousand times.. you absolutely know it even if you don't consciously think about it."

A font forked at least a dozen times over the decades, with forks upon forks upon forks, full of nostalgia for times past.