Long before concrete made its appearance on the building scene in Rome, the Romans utilized a volcanic stone native to Italy called tufa to construct their buildings. Although tufa never went out of use, travertine began to be utilized in the late 2nd century B.C.E. because it was more durable.
        
             
        
        
        
Answer:
That's very interesting!
Explanation:
Nice detail! Poor theorists, that'll debunk that for sure. But that's an interesting thing to point out....
I s'pose our catboy isn't as magical as we all thought.
 
        
                    
             
        
        
        
Answer:
A
Explanation:
They depended on optical illusions because they weren't able to generate the things we can (they didn't have computers and such)