translation.en: And I went from what's called real numbers, which are points on a line, to imaginary, complex numbers, which are points on a plane, which is what one should do there, and this shape came out.
translation.zh: 我由所谓“实数”开始， 也就是数轴上的点， 到虚的“复数”， 也就是平面上的点， 人们应该在平面上研究。 这个形状出来了。