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In a residential area of ​​Sumer were no strong durable building materials such as stone and then figure out how the Sumerians made bricks from clay and hay land. Although lighter than stone, but it is durable.Including the city walls. Clay is also used as a key material in the wedge-shaped characters with inventions.

In the residential area of the mail school, Surat, they do not have a strong durable construction materials such as different types of stone. Sumer seek how to make bricks from straw, and land, which despite the lighter than stone, but it is durability. As well as the city walls. They also used clay as a material and in the invention of the letter keys.

in a residential area of the School is not exceeding one hundred thousand Baht or to both a strong durable construction materials such as stone, the inhabitants of the School exceeding one hundred thousand Baht or to both find a way to do so I think brick and straw from the land which, though lighter than stone, but it has the durabilityincluding the wall of the city, there is also used as a clay material in the letters patent wedge.