Bubble regions devoid of galaxies are seen giving structure to the universe; this is coincident with the observed filament structure of super-cluster complexes of galaxies. Similar filamentation is seen in the concentration of fluid boundaries when a (soapy) foam is filled with pressurized bubbles (of air). Note, it is the internal pressure of those bubbles that maintains the bubble boundaries. Further, three or more mutual bubbles will see an accumulation of fuild along the common linear boundary (ie: a filament develops). Could it be possible that the bubble regions between the galactic filaments are filled with localized concentration of dark energy? As such, the dark energy would push matter (visible and dark) out of the enclosed bubble regions. Collectively the amalgam of bubbles would lead to the accelerating expansion of the the universe. What this conjecture may serve is to explain the curious mechanism for the formation of the galactic filaments.