Ties!

[infrarad]

"Thomas Fink and Yong Mao used a mathematical model known as a persistent random walk to examine the sequence of moves involved in knotting a tie.

"...Their mathematical approach included parameters that defined the aesthetics, strength, and balance - the rhythm in the hand movements - of knot tying.

"The analysis not only reveals why we knot ties in the way we do, but also predicts several new styles."