  We conduct three-dimensional hydrodynamical simulations of two opposite jets
that interact with a spherical slow wind that includes a denser shell embedded
within it, and obtain a bipolar nebula where each of the two lobes is composed
of two connected bubbles and Rayleigh-Taylor instability tongues that protrude
from the outer bubble and form the `columns crown'. The jets are launched for a
short time of 17 years and inflate a bipolar nebula inside a slow wind. When
the bipolar structure encounters the dense shell, the interaction causes each
of the two lobes to split to two connected bubbles. The interaction is prone to
Rayleigh-Taylor instabilities that form tongues that protrude as columns from
the outer bubble. The bases of the columns form a ring on the surface of the
outer bubble, and the structure resemble a crown that we term the columns
crown. This structure resembles, but is not identical to, the many filaments
that protrude from the lobes of the bipolar planetary nebula Menzel~3. We
discuss our results in comparison to the structure of Menzel~3 and the ways by
which the discrepancies can be reconciled, and possibly turn our failure to
reproduce the exact structure of Menzel~3 to a success with jets-shell
interaction simulations that include more ingredients.
