Machinebrain sees the world and democracy as a series of mechanisms—clocks and gears, perpetual motion machines, balances and counterbalances. Machinebrain requires you to conceive of the economy as perfectly efficient and automatically self-correcting. Machinebrain presupposes stability and predictability, and only grudgingly admits the need for correction. Even the word commonly used for such correction—“regulation”—is mechanical in origin and regrettable in connotation.

Gardenbrain sees the world and democracy as an entwined set of ecosystems—sinks and sources of trust and social capital, webs of economic growth, networks of behavioral contagion. Gardenbrain forces you to conceive of the economy as man-made and effective only if well constructed and well cared-for. Gardenbrain presupposes instability and unpredictability, and thus expects a continuous need for seeding, feeding, and weeding ever-changing systems. To be a gardener is not to let nature take its course; it is to tend. It is to accept responsibility for nurturing the good growth and killing the bad. Tending and regulating thus signify the same work, but tending frames the work as presumptively necessary and beneficial rather than as something to be suffered.

Machinebrain treats people as cogs: votes to be collected by political machines; consumers to be manipulated by marketing machines; employees to be plugged into industrial machines. It is a static mindset of control and fixity, and is the basis of most of our inherited institutions, from schools to corporations to prisons.

Gardenbrain sees people as interdependent creators of a dynamic world: our emotions affect each other; our personal choices cascade into public patterns, which can be shaped but rarely controlled. It is a dynamic mindset of influence and evolution, of direction without control, and is the basis of our future.