How did the Sumerians write?

Many of the early script languages did not use any letters, but used small pictures instead. Around 3500 B.C., the Sumerians in Mesopotamia invented the cuneiform script: Notches were made in wet clay tablets with a wooden handle. The clay tablets then dried and became hard. Initially, there were about 1500 picture – like symbols, from which 800 simplified symbols developed gradually. Many of these small notches put together resulted in a word – just like a picture puzzle of today or the script of the Chinese.