The natural order of things

Matt Ridley says that Darwinian selection explains the appearance of seemingly ‘designed’ complexity throughout the world — not just in biology but in the economy, technology and the arts

Charles Darwin, who was born 200 years ago next month, has spent the 150 years since he published The Origin of Species fighting for the idea of common descent. Though physically dead, he is still doing battle for the notion that chimps are your cousins and cauliflowers your kin. It is a sufficiently weird concept to keep Darwin relevant, revered and resented in equal measure. But in some ways it is less radical and topical than his other, more philosophical legacy: that order can generate itself, that the living world is a ‘bottom-up’ place. On the internet, Darwinian unordained order is now ubiquitous as never before.

Living beings are eddies in the stream of entropy. That is to say, while the universe gradually becomes more homogeneous and disordered, little parts of it can reverse the trend and become briefly more ordered and complex by capturing packets of energy. It happens each time a baby is conceived. Built by 20,000 genes that turn each other on and off in a symphony of great precision, and equipped with a brain of ten trillion synapses, each refined and remodelled by early and continuing experience, you are a thing of exquisite neatness, powered by glucose. Says Darwin, this came about by bottom-up emergence, not top-down dirigisme. Faithful reproduction, occasional random variation and selective survival can be a surprisingly progressive and cumulative force: it can gradually build things of immense complexity. Indeed, it can make something far more complex than a conscious, deliberate designer ever could: with apologies to William Paley and Richard Dawkins, it can make a watchmaker.

Ideas evolve by descent with modification, just as bodies do, and Darwin at least partly got this idea from economists, who got it from empirical philosophers.