Pyramus et Thisbe 55-104

In this poem there are many walls, physical ones and various metaphorical ones.
First, there's the wall itself between their homes. It separates Pyramus and Thisbe by just being there. Although it separates them, it also is the only way for them to talk, which is pretty ironic. It keeps them from seeing and touching eachother but allows them to speak through a small crack, "fissus erat tenui rima, quam duxerat olim, cum fieret, paries". The other physical wall is the one which Semiramis surrounded the city with, "ubi dicitur altam coctilibus muris cinxisse Semiramis urbem". This wall separates the wilderness from the city where all the people live.
In a more poetic and metaphorical sense, there is another wall..the one that the fathers of Pyramus and Thisbe have created by forbidding them to be married, "sed vetuere patres".
Pyramus and Thisbe are separted by so many things, you can tell that they are not suppose to be together and maybe even that these things are the only way to stay safe.