In addition to being a fairly straightforward metapor for how I think and write and learn, Drift and Diffusion are mathematical terms. "Drift" is (usually) a deterministic effect like Newton's laws and "Diffusion" is a random effect like molecular bombardment.
The most picturesque description I know is the route of a dandelion seed in a stream. The current is drift, and all the while water molecules are causing tiny oscillations that keep the motion from being predictable and smooth. Such mathematical models played a role in my (fading) thesis work, and in quantitative finance.