There are six basic word orders. Which languages have different ones and where? Why is this one so rare?

Sources: https://docs.google.com/document/d/1W...
Support: https://docs.google.com/document/d/1W...

Art, animation and music by me. Open doc above to read sources for claims and for pics, sfx.
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~ Briefly, but with small spoilers ~

When I was young, I got interested in how sentences are arranged in various languages. When my grammar books treated basic word orders as different types of languages, I began to imagine them as a linguistic horoscope. I'm back with animated questions about that language zodiac:

What even is word order?
How many languages have different ones and where?
Why is SOV so common and OSV so rare?

Along the way, we'll realize that the two least common word orders, OVS and OSV, are found among the languages of the Amazon. Check out my sources document above to even more.