Eta Carinae, filaments and outflow.

 

Image of Eta Carinae. Credit N. Smith / J.A. Morse (U. Colorado) et al. NASA.

This expansion of matter from Eta Carinae, thought to be eruptions from dying star binary, may be part of a system of outflow connected to double filaments. They appear all over the Galaxy and seem to be, somehow, connected to star creation.
In this image two tube like structures align with the central stars to forge activity in expansive not destructive process. I suggest the arrival of matter via filaments (which are known to connect with star formation and, hence, matter) may better describe possibilities for material that escape and form this beautiful symmetrical outflow. Maybe, other symmetrical outflow from planetary nebula can also be associated with transfer over long periods from filaments. This has implications for star and galaxy evolution as a vector for matter transfer across the Universe.
This is not the only example of double filament connections to the active centre star in planetary nebula. See NGC 2346,  Hubble 5

 NGC 2346 

NOAO scientists, using the Gemini Observatory 8-meter telescope in Chile, have obtained the highest resolution image ever obtained for the planetary nebula NGC 2346. This shows two filaments connected to the centre.