The Source 1982 one on netflix

An animated short film by Jerzy Kucia, made using means characteristic of his work and consistent with the artist’s melancholic poetics. The combination of various techniques, including cut-out and stop-motion animation, and frames bathed in black and white, showing (not entirely) still life, are tied together by the musical composition of Marek Wilczyński, Kucia’s several-time collaborator. What is the source in the title?