Icebergs.
Well not really icebergs. We are constituted by some 50, 70, 100 trillion cells, nobody knows exactly how many but they would be enough to over-populate the whole solar system if to each cell there was a corresponding human being. There are 220 different types of cells, all deriving by that only initial cell which was the fecundated egg in the ovary, the totipotent cell, as they call it, which will divide and divide and divide in a frenetic activity, and differentiate in those 220 different types, each with the destiny of a different life span. Some will last all our life, like the neurons, some only some hours like the blood red cells, being preprogrammed to die or to live like the replicants of “Blade runner”. The incredible fact is the degree of solidarity and collaboration between them. Some come to replace dying companions, some rush to defend the territory from external dangerous intrusions, viruses, bacteria, or to repair damage, or to do away with the undesired debris. Some attend to their task that may also be that of processing information from the outside world and making decisions.
And the whole thing hosts an even larger number of bacteria, also living beings, vital to our life, external collaborators in various ways, mercenaries in a way.
They identify each other to know if they must help one of their kind or destroy an hostile intruder.
What is most baffling is that they all are replications of that unique initial cell and that ALL (except red globules) contain in their nucleus that store of informations, library or living encyclopaedia that is the DNA and that would in theory reproduce the whole process from the beginning to populate some solar system.
And can we think that we, with our conscious mind (the tip of the “iceberg”), can control the whole machinery (if it is a machinery, I don't think it's only a machinery) ? That a pact, a command, an agreement, a conversation of a few hours between two or more human beings can modify the ultimate destiny, course and direction of these creatures who have been built in millions of years?
In a sense all this should be reassuring. We belong to something which overwhelms us, sometimes in a pityless way, sometimes benevontly, and rewards us, in this life, with pain and with joy.