What I like most about this is the sense that the entire conventional notion of a “core” is subject to revision, not as unmoving, but at its own core, a dynamism.

Once the world is seen as a set of cycles rather than of things it is easier to imagine interesting ways for them to mesh like cogs…

Sufficient, perhaps, just to stop and think how strange it is that the inner core, imperviously locked away since the creation of the world, may yet be added to the long list of other solid-looking things, such as the Himalayas and the Atlantic Ocean and the planet itself, that are in some ways better understood not as places, but as processes.

“The unsolid Earth,” The Economist, August 5, 2010 

It’s also just fantastically written.