NOTE: As many people have pointed out in the comments, it's important to remember that this is only one theory of the evolution of script systems. The derivation of Brahmi script from Aramaic is especially contentious and is seen by many modern linguists as an outdated theory. There were also some simplifications regarding the origins of the Arabic script for the sake of saving time: I apologise if either of these things were misleading.

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Art by kvd102