Five lessons from a 1,000-year-old design system
Ahmed H. Aly

I never am able to read articles till the end, they usually either go out of context or plain boring, but this one I read till the end, being a Calligraphy student of Thuluth, apart from my interest in this script I can also now relate it to my UX and other design projects. Excellent write up. Some examples you have shared speecially, the Kassa curve, can you please share if this is from a book? or where I can such details for other letters?