One can put words to pain, but only after the event, when trying to discern what has just happened, referring to all sorts of disruptive moments - moments of discontinuity, of dissonance, of dismemberment, of disharmony even in the most familiar suddenly turns into the strangest experience.

We have the frequent rhythmic surprises, syncopations, misplaced accents, Schumann's startling changes of key, with enharmonic switches or sometimes plunges without warning, completely disrupting the normal process of modulation. Schumann's music makes us getting touch with something that we do not want to know about, that might have to do with our own private madness, the foreign part inside us. 

At other moments in his music, discordances are expressed by subtle disparities in the musical movements where oppositions, contradictions, and paradoxes often appear fleetingly, leaving the listener and the interpreter suddenly thrown into a troubled state of mind, as, for example, in the Papillons.

(Listening to Robert Schumann: My Suffering, His Pain by Jacques Mauger)