In the presence of an angry person one feels excited and inclined to anger, the contact of a humorous person spreads around an atmosphere of humor, in the presence of a cold person one becomes cold, the contact of a warm-hearted person warms one; and all this is done by the medium of breath. If an angry person were to close his breath while angry, much less of his feeling would affect another; if a person who is subject to humor would close his breath in the presence of an expert comedian he could protect himself from being influenced by him.