Though the computing we performed was sub-trivial (adding one and one was a major undertaking!), the physical performance of that computing imbued me with *Fingerspitzengefühl* ("fingertip feeling"):
https://en.wikipedia.org/wiki/Fingerspitzengef%C3%BChl
This stood me in great stead in the years to come. To this day, when I think about my computer, I sometimes imagine those little cardboard tokens, shuffling in and out of the slits in my paper CARDiac.
7/