Imagine a circular wheel rolling, without skidding, on a flat, horizontal surface. The #locus of any given point on its #circumference is called a #cycloid. It is a #periodic#curve with #period over the #circle's circumference and has #cusps whenever the point is in contact with the surface (the two sides of the curve are tangentially vertical at that point).
I kinda remember a #fantasy short story (or maybe novella) I read several years ago, about a kid (?) who could somehow portal across worlds, which had "Stratagem" in the title and was the first published work of a young author.
I know it's very little to go on but maybe somebody here can help me?
Must have been on #beneathceaselessskies, #clarkesworld, #locus or #FSF since those are the magazines I've variously subscribed to.