"If you choose to believe me, good. Now I will tell how Octavia,
the spider-web city, is made. There is a precipice between two
steep mountains: the city is over the void, bound to the two
crests with ropes and chains and catwalks. You walk on the little
wooden ties, careful not to set your foot in the open spaces, or
you cling to the hempen strands.
Below there is nothing for hundreds and hundreds of feet: a few
clouds glide past; farther down you can glimpse the chasm's bed."
(Italo Calvino,-Invisible Cities)