“There are doubtful creatures, the Corallines, for instance, that are claimed by all the three kingdoms. They tend towards the animal, they tend towards the mineral, and, finally, are assigned to the vegetable. Perchance they form the real point at which Life obscurely and mysteriously rises from the slumber of the stone, without utterly quitting that rude starting-point, as if to remind us, so high placed and so haughty, of the right of even the humble mineral to rise into animation, and of the deep and eternal aspiration that lies buried, but busy, in the bosom of Nature.”

Jules Michelet, 1861