DRAWING, THE UNIVERSAL LANGUAGE
An illiterate who doesn't know how to read or write can hardly understand when you try explaining something to he or she in a written or spelling manner, reasons because, there is a communication gap that bridges in-between the both persons.
Take for instance, if I write ''APPLE '' just like I have it in the diagram below
trying to tell someone who dose not know how to read or write that I want to eat apple, the person will never understand what am saying,
But the moment I Draw a picture of Apple just like I have it in the diagram below 
It gives the person a better understanding no matter how illiterate or dull the person may be.
ART SPEAKS EVERY LANGUAGE
That's true seeing is believing as always said by people
Thanks👍 @augustinej for taking your time to go through my post