<Tr> <Td> qr, </Td> <Td> fragments 5th - century orchestra . </Td> </Tr> <Tr> <Td> s, </Td> <Td> 4th - century portico . </Td> </Tr> <Tr> <Td> t, </Td> <Td> old Dionysus temple . </Td> </Tr> <P> The Romans copied the Greek style of building, but tended not to be so concerned about the location, being prepared to build walls and terraces instead of looking for a naturally occurring site . </P>

What are the two kinds of worlds in the theatre