The purpose of the use of striking colors by primitive races was this, that as soon as a man came home or somebody else came into the house, he should feel that there was a home. In Japan the doors are still painted red, in order that before the host comes to meet a visitor with his warm heart, the red door may welcome him with its warmth. In all ages the striking effect of colors has, naturally, been felt and appreciated most, while their more peaceful, healing, and harmonious effects were not generally understood as the people were mostly not evolved enough to enjoy them. This is why striking colors were mostly used in the beginning of architecture.