When it gets into " i ", things get really interesting.

I was once greatly surprised running into a lecture on i once, from
none-other than a purchasing agent for a box-maker... pre-computer. He
showed me his equations for getting the maximum use of a given width
and length of corrugated cardboard (roll) sheeting... each one included
i. This guy was a high-school drop-out, but he used 'imaginary numbers'
every day.

Peter Wieck
Wyncote, PA