It is generally understood that, at a certain stage, the quantum world transitions into the macro-world; we do not observe quantum effects in the macro-world because macroscopic objects are composed of a vast number of quantum particles whose behaviors average out. So, is there a specific "boundary" beyond that? Could we hypothesize that a collection of macroscopic objects—an assembly of such entities—might also be subject to certain quantum or other effects? ~ Could this all be viewed as a chain of fundamentally identical processes, where a specific state simply becomes invisible at a certain stage? (This reminds me somewhat of the concept of time -but in reverse: time does not exist in the universe as a whole, yet it exists within each individual branch.)