The motif in this animation is Transmigration. Alchemy tells us that any material must first be reduced to its pre-differentiation condition for itself to change. If transmigration is defined as a change to a new birth after death, this process resembles that of mixing various materials in an unknown(dark) mixer. This process contains death and restoration to life, baptism and recurrence to pre-form condition. Dissolve and then coagulate! Short lived light will make its tracks.