The breathing cube now lives inside a sampled flow field. Outer shells, advection particles, and the embedded inner breathing form all read the same zero-state field, so the structure behaves like part of a living medium rather than a self-contained object.
This version integrates a Flod-style field: particles are advected through the medium, cube vertices sample local flow, and the inner form is bent by the same field so the whole object reads as one coherent system.