We used hieroglyphs for our written communication. There were many variations, but they fell in to two major categories. The Ancient Hieroglyphic Style was the first, and an example is below. It consisted of one-hundred universally agreed upon symbols for common words.
As the seasons passed we added symbols and subtle tweaks to represent tense, ownership, conjunctions and so forth. This was what we called the Modern Hieroglyphic Style, not pictured. All of our hieroglyphs read from top to bottom.
I don’t think our writing was primitive because of a limited capacity on our part, but rather, a natural result of our preference to live in the present and our ability to communicate with urine.