In this discipline, cloning is a private operation and the only one way to
create objects. All object creation, so, pass through the self-send
self.clone { … } operation, where { … } are the additional/extension
slots for the child/owned object. Without any kind of ownership
releasing/transference beforehand, the owner will only own objects resembling
himself. Cloning is assumed to be concatenative, if it were "delegative",
owned/child objects would be able to observe effects implicitly from the
owner/prototype, a really undesirable thing for sure.
It can be achieved by making cloning the only one possible operation to allocate memory in the system (besides making cloning a private operation, that is, an operation available only for the object itself). Cloning indirectly is also possible, the owner just need to expose a method performing cloning internally for its own owner (i.e, owner's owner).