  In this review I present the binary model for the shaping of planetary
nebulae (PNe) as I view it, in the context of historical evolution of other
models for the shaping of PNe over more than 30 years. In describing the binary
model, I concentrate on works published since the last IAU meeting on PNe. I
think stellar companions are behind the shaping of bipolar PNe, i.e., having
two lobes with an equatorial waist between them, and extreme elliptical PNe,
e.g., having a dense equatorial ring, but no lobes. The question of whether a
planet is required to spin the progenitor in order to form a moderate
elliptical PN, or whether a single stars can form moderate elliptical PNe, I
consider to be an open question.
