Among the creative ideas in the story are a way to warn a potential victim that he is about to be attacked from another dimension and a way that the inter-dimensional assassin can kill a victim using only a pin. But most of its descriptions of higher dimensions are rather standard (ants crawling on surfaces, spheres intersecting planes, etc.).

This story first appeared in The Book of Swords (2017) and more recently was republished in the Ken Liu collection The Hidden Girl and Other Stories (2020).