Microdimensions is a spatial kind of dimensions that can be found in any Realm, which goes below spacetime.
This kind seems to be absolutely boundless, as it contains infinite Microdimensions without boundaries. The topology is always euclidean, as settled by Distorsion. (See Dimensional Blueprint Particles) The system of existence ranks is really basic in Microdimensions, as only existence and non-existence objects can handle.
All Microdimensions build up to form Chaos Fabric, a infinite-capacity blueprint for every single object in spacetime. Everything in all Chaos Fabrics is made of 4 ultimate building blocks: ·, ○, ⬤, and Blueprint Particles. Only Blueprint Particles are required to construct the entire Realm, while Uqreak fibers build objects in that Realm by indirectly jumping from Microdimensions to spacetime. Subexistons could exist, but particles that assign existence ranks can't be contained.