I said that no physical object is a manifold. This may be a better answer to Nick's question. The envelope of a cloud, if it could be defined, might be a manifold depending on cusps etc. Those might be handled by combining manifolds of different dimensions. This would not be a realizable project in my opinion.
Frank --- Frank C. Wimberly 140 Calle Ojo Feliz, Santa Fe, NM 87505 505 670-9918 Santa Fe, NM
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