I don't think it's obvious per se, but people who have studied numerical methods at the graduate level have likely seen fractal boundaries like this before - ev

I don't think it's obvious per se, but people who have studied numerical methods at the graduate level have likely seen fractal boundaries like this before - even Newton's method produces them [0]. The phenomenon says more about iterative methods than it says about neural networks. [0] https://en.wikipedia.org/wiki/Newton_fractal https://en.wikipedia.org/wiki/Newton_fractal