Mesopotamian were the first civilization to introduce writing form. Cuneiform is the writing system which developed in Mesopotamia. Clay tokens were used to trade and the marking on the clay gave rise to pictographic writing.
Step-by-step explanation:
Complexity in trade compelled the Mesopotamian to follow a writing system. Initially pictograph writing was practiced. cuneiform came into practice both phonetically and semantically rather than defining objects only as pictures.
Clay is extensively used in making cuneiform tablets. Wet clay is used and the pictures and markings are drawn and then the tablet is made to dry. A stylus is used which has v shaped edge. The clay tablet is dried up which was used to represent many abstract aspects too.