So you know how Newton decided that the rainbow had 7 colours and in school they made us draw rainbows with 7 colours? But that this is scientifically inaccurate and that there are actually an infinite amount of colours in the rainbow?

And how this lead to "light blue" and "dark blue" being considered socially as two shades of the same colour but pink and red are two different colours?
But other cultures don't necessarily perceive colours the same way? And so the categories shape our view of the world?

Well gender and sex are the same thing. We built, in our society, two gender categories based on something that is scientific that is sex. But the two categories are arbitrary and shape our view of the world.

So when you ask a kid to draw a woman it won't involved detailed anatomy of reproductive systems. But maybe dresses and long hair and jewellery... And the same way it's hard to describe why light blue is blue but light red is pink, it's hard to describe how we perceive womanhood

If you ask someone to define woman they'll probably say something along the lines of producing ova or can be pregnant or XX chromosomes. And if you ask someone to define blue they might give you a range of wavelengths. But ultimately that's not really how we use it day to day.

And if you try to understand what criteria are involved into a person deciding this individual is a woman and this one is a man, it is going to vary widely from one culture to the next. The same as with colours.