knots

https://www.simonsfoundation.org/quanta/20131209-knots-unravel-mysteries-of-fluid-flow/

Here we find ourselves in a thought factory, in which, as in the “Weaver’s Masterpiece”:

	“One tread moves thousands of threads,
	The little shuttles fly back and forth,
	The threads flow on unseen,
	One stroke ties thousands of knots.”