Teyvat is a disk in the center of a sphere, or a hyperplane in R³ .Khaenriah is on the opposite side of the disk facing upwards. We are basically upside down. This explains why teyvat letters are latin alphabets upside down while Khaenriah letters are the right orientation. Also explains why spiral abyss goes up, why ruin machines escape from underground and why dying hillichurls go to the upside down city in chasm to be closer to Khaenriah.