Of these three writing systems, therefore, only the earliest, the Mesopotamian cuneiform script, invented in Sumer, present-day Iraq, c. 3200 BC, can be traced without any discontinuity over a period of 10,000 years, from a prehistoric antecedent to the present-day alphabet. Its evolution is divided into four phases: (a) clay tokens representing units of goods were used for accounting (8000–3500 BC); (b) the three dimensional tokens were transformed into two-dimensional pictographic signs, and like the former tokens, the pictographic script served exclusively for accounting (3500–3000 BC); (c) phonetic signs, introduced to transcribe the name of individuals, marked the turning point when writing started emulating spoken language and, as a result, became applicable to all fields of human experience (3000–1500 BC); (d) with two dozen letters, each standing for a single sound of voice, the alphabet perfected the rendition of speech. After ideography, logography and syllabaries, the alphabet represents a further segmentation of meaning.
The direct antecedent of the Mesopotamian script was a recording device consisting of clay tokens of multiple shapes (Schmandt-Besserat 1996). The artifacts, mostly of geometric forms such as cones, spheres, disks, cylinders and ovoids, are recovered in archaeological sites dating 8000–3000 BC (Fig. 1). The tokens, used as counters to keep track of goods, were the earliest code—a system of signs for transmitting information. Each token shape was semantic, referring to a particular unit of merchandise. For example, a cone and a sphere stood respectively for a small and a large measure of grain, and ovoids represented jars of oil. The repertory of some three hundred types of counters made it feasible to manipulate and store information on multiple categories of goods (Schmandt-Besserat 1992).
After four millennia, the token system led to writing. The transition from counters to script took place simultaneously in Sumer and Elam, present-day western Iran when, around 3500 BC, Elam was under Sumerian domination. It occurred when tokens, probably representing a debt, were stored in envelopes until payment. These envelopes made of clay in the shape of a hollow ball had the disadvantage of hiding the tokens held inside. Some accountants, therefore, impressed the tokens on the surface of the envelope before enclosing them inside, so that the shape and number of counters held inside could be verified at all times (Fig. 1). These markings were the first signs of writing. The metamorphosis from three-dimensional artifacts to two-dimensional markings did not affect the semantic principle of the system. The significance of the markings on the outside of the envelopes was identical to that of the tokens held inside.
About 3200 BC, once the system of impressed signs was understood, clay tablets—solid cushion-shaped clay artifacts bearing the impressions of tokens—replaced the envelopes filled with tokens. The impression of a cone and a sphere token, representing measures of grain, resulted respectively in a wedge and a circular marking which bore the same meaning as the tokens they signified (Fig. 2). They were ideograms—signs representing one concept. The impressed tablets continued to be used exclusively to record quantities of goods received or disbursed. They still expressed plurality in one-to-one correspondence.
Etc etc
The Evolution of Writing | Denise Schmandt-Besserat
Don't get me wrong, I absolutely believe this is God's work, but an instant "kapow moment" in which God just implanted a dictionary into mankind's brain, just seems unreasonable.