People say the effect is only on the mind. It is no such thing. The effect is on the body, too. Little as we know about the way in which we are affected by form, by color, and light, we do know this, that they have an actual physical effect. Variety of form and brilliancy of color in the objects presented to patients, are actual means of recovery.
Florence NightingaleGo into a room where the shutters are always shut (in a sick-room or a bed-room there should never be shutters shut), and though the room be uninhabited-though the air has never been polluted by the breathing of human beings, you will observe a close, musty smell of corrupt air-of air unpurified by the effect of the sun's rays.
Florence Nightingale