We present a scenario for an anisotropic mass ejection from asymptotic
giant branch variables, caused by rotation effects on the inflated at
mosphere formed by the stars pulsation. Due to the large radii envolve
d with the inflated atmosphere, the rotation velocity needed for causi
ng significant anisotropy in the mass loss is dramatically reduced. Po
ssible sources for these rotation velocities are discussed. Such aniso
tropic mass ejection generates a density contrast in the ''slow wind''
that can produce the various aspherical morphologies observed in plan
etary nebulae.