The human being is, physically and mentally, so constructed that he can endure only a certain degree of vibrations, audible or visible. Therefore noise distracts his mind and strong colors also make an uncomfortable effect. All that is called noise is beyond the range of his power of endurance. Generally soft colors appeal to him more, for the vibrations of soft colors are soothing and do not demand endurance on the part of man. But atmosphere demands the greatest strength of endurance. One can endure color or sound, but it is difficult to endure atmosphere which is not congenial. Man prefers to endure a color or a sound which is difficult to endure rather than the personality of another person. Because human activity has a more jarring effect than color or sound.