Such abstraction can be used to obfuscate information. Could they contain and have contained hidden messages? Hushed passwords to enter secret areas of the temples hidden in plain sight?
Hilbert curves [4] could be the substrate (the coordinate system), and Kufi writing could be indeed encoded information maybe by XORing each point between the curve and the kufi word.
I'm just blabbering around. But it's difficult to disassociate the two in my mind.
0: https://www.shutterstock.com/image-vector/kufi-ayat-kursi-al...
1: https://i0.wp.com/majnouna.com/wordpress/wp-content/uploads/...
2: https://i.pinimg.com/236x/f2/f7/e9/f2f7e99d6bfe75042313adbe6...
4: https://www.researchgate.net/profile/Christoph-Schierz/publi...