I didn’t know something like this was done

In the eighteenth century, artists in Mexico (and to a lesser extent in other parts of Latin America) created paintings that depicted the different racial mixtures.

Source: Slavery, Race, and Whiteness in Mexico

I didn’t know it had been so complicated back then. Sure, in history class at school we would delve into this sort of thing, but we’re learning it as kids and you don’t ever revisit it until you have kids of your own — unless you study history in one of it’s myriad forms.