…but don’t KNOW they know!
Ajectives in English absolutely have to be in this order: opinion-size-age-shape-color-orgin-material-purpose Noun. So you can have a lovely little old rectangular green French silver whittling knife. But if you mess with that word order in the slightest you will sound like a maniac.
It’s an odd thing that every English speaker uses that list. But almost none of us could write it out. And as size comes before color, green great dragons can’t exist.
Try it in your own writing. Check out your most recent book, or the book lying nearest to you right now. It’s a phenomanon!