" My teacher read me "The Chambered Nautilus" [a nature poem], and showed me that the shell-building process of the mollusks is symbolical of the development of the mind. Just as the wonder-working mantle of the nautilus changes the material it absorbs from the water and makes it a part of itself, so the bits of knowledge one gathers undergo a similar change and become pearls of thought. "

― Helen Keller , The Story of My Life