The people in the Roman civilization made many inventions. One of those inventions was glass. There were a group of people that made glass. They all used the same tools and machines to make the same kind of glass. All the glass looked the same; it was thin and clear.
Finally, the Roman empire collapsed because the aqueducts broke and the Romans had to leave the city. They needed to live near water. they couldn't make glass the same way because they didn't have the right tools and machines. The Romans wanted to invent new ways to make glass. They experimented with sand and ashes. They invented forest glass. Forest glass was never the same color. Forest glass was thicker and it had many different styles.
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