Take a moment to appreciate how very difficult it is to read this sentence.
Well, not specifically that sentence, but every sentence. Cognitive scientists will tell you that it’s a monumental task to learn how to read even just one WORD of a sentence. You have to look at random, complex, squiggly marks on a page, identify the letters as representing sounds, and then translate those sounds into a word that makes sense. And you have to do it quickly, automatically, or risk losing the meaning completely.