“As the ox turns” – I encountered it in linguistics as a description of writing that is read from left to right, and then on the next line right to left, and then back again across the page. And so on. Just like an ox plowing a field.
Also useful for describing, for example, the configuration of a TSA airport security line, or the queue for Disney rides.
(This is why linguists and grammarians are not invited to holiday parties. We’re amused by dull things.)