There is a psychological conception of rhythms used in poetry or music which may be explained thus: every rhythm has a certain effect, not only upon the physical and mental bodies of the poet or on him for whom the poetry is written, on the musician or on him to whom the song is sung, but even upon their life's affairs. The belief is that it can bring good or bad luck to the poet and musician, or to the one who listens. The idea is that rhythm is hidden under the root of every activity, constructive or destructive, so that on the rhythm of every activity the fate of the affair depends. Expressions used in everyday speech such as: "he is too late", or "it was done too soon", or "that was done in time", all show the influence of rhythm upon the affair. Events such as the sinking of the Titanic, and the amazing changes that took place during the late war, if keenly studied, can be accounted for by rhythm working in both mental and physical spheres.