When stuff gets out of hand, we don’t open disciplinary borders. We craft new disciplines: digital humanities, human geography, and yes, computer science (note that “science” glued to the end, to differentiate it from mere “engineering”). In time, these great new territories get their own boundaries, their own defenders. The interdisciplinarian is essentially an exile. Someone who respects no borders enjoys no citizenship.

All you have to do is look at a tree—any tree will do—to see how badly our disciplines serve us. Evolutionary theory, botany, geography, physics, hydrology, countless poems, paintings, essays, and stories—all trying to make sense of the tree. We need them all, the whole fragile, interdependent ecosystem. No one has got it right yet.