Parallel worlds exist not only in the books by science fiction writers. One can find them in medicine, too. In this article I will share the analogies that I saw visiting the production facility Lumenis in Israel. It turned out that we have a lot in common with the Israel developers. So ...
Nature, on its evolutionary path, not only creates complex living structures, perfecting them from unicellular to multicellular, but also seeks to prolong their existence, endowing them with a number of properties at different levels (cellular, organ, organismal, population).
Nature strives for permanence and integrity of living structures, endowing them with the ability to self-reproduce and compensate for damage. Living structures are protected from the external environment by creating envelopes.
Creating membranes is a property of living structures. Human skin is one of them.