While these two works are independent, they are linked to each other by the juxtaposition of two energies: feminine and masculine. they each have to be performed with a different instrument.
There is a study of the possibilities offered by the double bass. The title simply reflects the most obvious feature of the piece; a continuous flow of semiquavers organised around two main thematic ideas. It is remarkable that a persistent idea in harmonic interval gives way to the true perpetuum.