I find computers to be a little strange.
I can sit at my keyboard and design you up a pedal assembly with all the levers, fulcrums, piviots, forces and vectors with no problem.
I can produce you a set of graphics that will show you the flow, volume and pressures of air flowing through a tube, but when it comes time to cut and weld I have to use pencil, onion paper and a slide rule to make it pretty, I just can't make it pretty from a keyboard.