Making the Oyster
You can’t make an oyster out of nothing, nor you can’t do it in a day. You’ve got to start with a vast variety of invertebrates, the belemnites, trilobites, jubusites, amalekites, and that sort of fry, and put them in to soak in a primary sea and observe and wait what will happen. Some of them will turn out a disappointment; the belemnites and the amalekites and such will be failures, and they will die out and become extinct in the course of the nineteen million years covered by the experiment; but all is not lost, for the jubusites will develop gradually into encrinites and stalactites and blatherskites, and one thing and another, as the mighty ages creep on and the periods pile their lofty crags in the primordial seas, and at last the first grand stages in the preparation of the world for man stands completed, the oyster is done. Now an oyster has hardly any more reasoning power than a man has, so it is probable that this one jumped to the conclusion that the nineteen million years was a preparation for him. That would be just like an oyster, and, anyway, this one could not know at that early date that he was only an incident in the scheme, and that there was some more to the scheme yet. (Mark Twain—A Biography).