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@ajroach42 Weird thought -- couldn't these just be progressive enhancements instead of right angles?

A telephone is just a faster letter.

Radio/TV -- pretty/noisy books.

Automobiles -- horses that cost more and are more expensive to feed.

None of the above really changed how we treat each other.

For a full-on right angle, I think something like the telescope or the microscope changed society much much more.