The parting in his short gray hair was almost unnaturally straight, and his narrow toothbrush mustache looked as though he trimmed it using a slide rule.
The guy with blueprints; the guy in a three-piece suit; the guy with a slide rule and calculator; the guy that's going to pave the forest and perhaps destroy whole ecosystems.
So, the calculator–the thing that we might recognize as a calculator–kind of has to have a different form because the slide rule's form isn't cutting it.
In other words, you can model things with great predictability and accuracy using supercomputers that you couldn't possibly do sitting with a slide rule or sitting with Traditional mathematics.