Functional Animation: Interactive Animation in Digital Artifacts

This is a fundamental view of the world. It says that when you build a thing you cannot merely build that thing in isolation, but must repair the world around it, and within it, so that the larger world at that one place becomes more coherent, and more whole; and the thing which you make takes its place in the web of nature, as you make it.
Christopher Alexander, 1964
Notes on the Synthsis of Form.

A man-taught man would have picked his way with many stumbles through the cheating moonlight, but Mowgli's muscles, trained by years of experience, bore him up as though he were a feather. When a rotten log or a hidden stone turned under his foot he saved himself, never checking his pace, without effort and without thought.
Rudyard Kipling, 1895
The Spring Running in The Second Junglebook