The Arch of Dividing is an arch made from jagged, black metal woven from iron thistles. New Waywards are suspended by a rope for a dividing.
The dividing determines which hemisphere they're going to be in. Most new Waywards use already tried methods of escaping such as untying or severing the cord. However, some Waywards like Sophie come up with more unconventional ways of escaping, like almost burning down the entire arch and rope.