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Quote of the Week
(February 26, 2024)

Harvard biologist Richard Lewontin once described how you can excise the developing limb bud from an amphibian embryo, shake the cells loose from each other, allow them to reaggregate into a random lump, and then replace the lump in the embryo. A normal leg develops. Somehow the form of the limb as a whole is the ruling factor, redefining the parts according to the larger pattern. Lewontin went on to remark:

“Unlike a machine whose totality is created by the juxtaposition of bits and pieces with different functions and properties, the bits and pieces of a developing organism seem to come into existence as a consequence of their spatial position at critical moments in the embryo’s development“.

A developing organism, Lewontin adds, “is like a language whose elements ... take unique meaning from their context”.

(from Chapter 6, “Context: Dare We Call It Holism?”, in Organisms and Their Evolution — Agency and Meaning in the Drama of Life)

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