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Published online by Cambridge University Press: 22 September 2016
Dr. Osterbrock has given a comprehensive summary of the Symposium. I will discuss a few topics which seemed particularly interesting to me as a non-specialist: dust, the fate of pre-planetary ejecta, and inhomogeneities. Let me begin by describing a simple model of the planetary nebula (PN) phenomenon, which is suggested by the discussions we have heard at this Symposium, and which provides the framework for my other comments.