 Useche explained to a Colombian newspaper that the title Vana Espuma  comes from an expression used in the 1619 play Fuenteovejuna that he  found echoed in the Spanish translation of Freuds book On Dreams.  In the introduction, Freud talks about other scientists who  discouraged his work on this subject saying that dreams are "Schaum"  (froth) a word which translated into Spanish as vana espuma (Idle  Mist).