Crawstep

The Nac Mac Feegle use the crawstep to magically travel between worlds of all kinds, such as the demesne of the Queen of the Elves, the Underworld, and even into bigjobs' dreams. However, they are not able to use it to travel within a world; for that purpose they assure us they have “feets.”

The mechanics of crawstepping are actually pretty straightforward. To accomplish this, the pictsie throws back his shoulders, with his arms bent at the elbows, stuck out behind him. He leans back, thrusting one leg out for balance, and then he wiggles his foot in the air a few times. Finally he leans forward, vanishing as soon as his foot touches the ground.

The exact physics of the crawstep are unknown, even apparently to the Nac Mac Feegle themselves, and when asked, the only comment was, “It’s all in the ankle movement, ye ken.” Even so, it appears that humans can also use the crawstep, but the circumstances that allow this are unclear. Roland, who at the time was the son of the baron on The Chalk, uses it in Wintersmith to help retrieve the Summer Lady from an underworld that used to be called Limbo.