The white light includes all colours. It is all and it is nothing. The white colour reflects light the most. Next to windows, lamps and mirrors this colour has the greatest potential of bringing light into a room and enlarging it, gives it some more air to breathe. Through its reflecting structure white enables space and other colours to spread out. This is a reason, why, since the 20es white inner walls are preferred. But white is also distant, unreachable and is capable to leave a person alone by him or herself. So there are opponent ideas if in health institutions white should be the dominant colour. An advantage is the hygienic aspect but because of its missing hospitality it might be advisable to use at least a skillful combination with another colour. Also in private places a combination with one colour field wall with its subtle reflections onto the other white walls might have a vitalizing effect.