"I understand how scarlet can differ from crimson.... because I know that the smell of an orange is not the smell of a grapefruit.  I can also conceive that colors have shades and guess what shades are.  In smell and taste there are varieties not broad enough to be fundamental; so I call them shades... the force of association drives me to say that white is exalted and pure, green is exuberant, red suggests love or shame or strength.  Without the color or its equivalent, life to me would be dark, barren, a vast blackness."

Helen Keller