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?
I always found Kufi to be a form of space-filling curves[0], which was the original purpose: a form of decoration that can fill a surface such as edges around a building[1, 2], without depicting humans in stone, a form of art historically forbidden in Islam due the prevalence of statue idolatry at the time. Hence the prevalence of geometry (Zellij [3]) and calligraphy in areas historically islamic.
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.
