Not sure about the bubble... but Brian Goodwin suggests in 'How the Leopard
Changed its Spots' that the evolution of the eye is less like 'climbing
mount improbable' (Dawkins) and more like 'rolling down into a valley' -
i.e. the basic form of an eye is an emergent property of certain proteins
growing/expanding (I'm no biologist BTW) in a similar way to mushroom clouds
forming when hot air rises, or the formation of Overbeck's vortices in
moving fluids.
John-Paul Frazer
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