As a story about dimensionality Toy-Physics is a descendent of this series of books:
Flatland: A Romance of Many Dimensions, written in 1884 by Edwin Abbott (initially published under the penname A. Square)
Sphereland: A Fantasy About Curved Spaces & an Expanding Universe written in 1965 by Dionys Burger in response to discovery that stars in our universe are separating like dots on the surface of an expanding circle, sphere, or hypersphere
Flatland and Sphereland are both about creatures and their things embedded within a flat universe and unaware of a dimension hidden from their senses. Unlike those stories, the Theatre of Toy-Physics is not concerned with shapes, social order, or visitations from higher order beings. This story starts with the assumption that a host universe for flat creatures and their things would be made of atoms. From there, it is all about geometry - about discovering a viable framework for an expanding universe of atoms that exhibits behavior of the same kind as ours.
Go to next page: Demise of Sphereland