in the North and South. Presumably, a full MHD simulation that can reproduce the overall large asymmetry in the lobes would have to incorporate similar asymmetries in the magnetically-launched wind, thus implying an underlying asymmetry in the magnetic field at the base of the outflows. Asymmetries in the overall dust distribution, as well as the unexplained structures that we see in the dust distribution (e.g. region C) could presumably represent regions of locally enhanced density and/or temperature, resulting from cooling and associated instabilities (e.g., see Fig. 2 of @Huarte2012).\
The Calabash nebula is somewhat peculiar because of the large striking difference in the size of its North and South lobes. However its dusty nature makes it an ideal target for the type of investigation we present in this article, which addresses fundamental questions regarding the presence of large scale, organized magnetic fields in pre-planetary nebulae in general, and their role in the formation and shaping of these objects. We observed either toroidal or polar magnetic structures in other sources that have been investigated in the past. OH 231.8+4.2 is the only object with a clear X-shaped morphology (but also the best characterised). Although it is too early, and the data 