My condolences.

You guys are using windows?

The natural representation would be the transient solution u(t) or i(t). Harmonic solutions are merely a special case, for which it turned out complex numbers were useful (because of the way they can represent rotation). They certainly serve a purpose there, but imo this is not an instance of 'complex numbers appearing in nature'.

But that is hardly a 'natural occurence' of complex numbers - it just turned out that they were useful to represent the special case of harmonic solutions because of their relationship with trig functions.

Julia?

or just install and then shut down?