Early pictographic tablet (3100 B.C.).
Pictographs were turned on their sides (2800 B.C.) and then developed
into actual cuneiform symbols (2500 B.C.) -- as this clay tablet
Pictographs for star (which also meant heaven or god), head, and
water (on the left) were turned on their side (in the middle), and
eventually became cuneiform symbols (on right).
A cuneiform table (c. 2100 B.C.) listing expenditures of grain and