The condition of the mind is expressed not only in the countenance but also in the movements. Every movement denotes a certain change of thought and feeling. The more one understands the language of movements the more one comprehends this. In every thought and feeling the waves of the mind, so to speak, rise and fall, and as by seeing the waves one can notice whether the sea is rough or calm, so by noticing the movements of a person one can read the condition of his mind.