“Most biologists," (says Vogel, 1981) "seem to have heard of the boundary layer, but they have a fuzzy notion that it is a discrete region, rather than the discrete notion that it is a fuzzy region.”

—  Bill Mollison

quoting Vogel, Steven, Life in Moving Fluids; the Physical Biology of Flow, Willard Grant Press, Boston, 1981.
Source: Permaculture: A Designers' Manual (1988), chapter 4.4

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Bill Mollison 32
Australian permaculturist 1928–2016

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