Reality is complicated, but is it also complex?
You can of course make it easy on yourself and deny the difference.
Then, however, you not only have to disregard certain effects — including those in the economy, society or health policy — that have an impact on themselves, but also from mathematics.
People there have been calculating with so-called complex numbers for more than three centuries, and they don't have to be complicated.
Conversely, there is also enough complicated mathematics that is not complex but, as they say, real.
Now, the reality of mathematical objects - even real ones - is sometimes disputed. But anyone who only considers physical things to be realistic must ask themselves what the situation is with the mathematics with which this physical thing is described. After all, it has so far been possible to dismiss the complex numbers as a work of man: The theory of electromagnetism, for example, often and happily deals with complex numbers. But that only serves to simplify calculations there. The question was whether this also applies to quantum theory. Their basic equations are complex, but even their patriarchs were not comfortable with that. For example, Erwin Schrödinger — the one with the cat — described this situation as “unpleasant” in a 1926 letter to his Dutch colleague Hendrik Lorentz.
And indeed there are attempts to formulate quantum physics in a completely real way.
However, recently two research groups - one from Europe, one from China - showed in articles for the journals "Nature" and "Physical Review Letters" respectively, that this then leads to different predictions about the measurable reality than the established complex quantum theory makes .
So, then, it can be empirically proven that the real world is not real at the most fundamental level at which we can say anything about it.
Sounds complicated, but that's how it is.