In the context of the hypothetical imaginary universe described, the boundary layer between the container and the contained could be considered a transitional space or region where the container and the contained interact or interface with each other. This boundary layer could have various properties or characteristics that define it and distinguish it from the container and the contained.
For example, the boundary layer could have a physical or spatial nature, such as the walls of a container that define its interior and exterior. It could also have a temporal or functional nature, such as the conditions or rules that govern the exchange or transfer of contents between the container and the contained.
The nature of the boundary layer could depend on the specific context and the nature of the container and the contained. For example, the boundary layer between a cell and its external environment might be the cell membrane, which separates the interior of the cell from the surrounding tissue and controls the exchange of substances between the two. The boundary layer between a computer program and its data might be the interface or API that defines how the program accesses and manipulates the data.
In general, the boundary layer can be described as the space or region where the container and the contained interact or interface with each other, and which has properties or characteristics that define it and distinguish it from the container and the contained.