The Geologist's Chisel and the Potter's Rib: Two Modes of Subtraction

There’s a common thread in the work many of us do: we often get there by removing what isn’t needed. The blank page becomes an article by carving away irrelevant thoughts. The overflowing schedule becomes a focused day by hacking back commitments. This is the discipline of subtraction, the path to clarity. But I’ve come to see two distinct philosophies at play in this act, embodied by two very different tools: the geologist’s chisel and the potter’s rib.

The Shock of the Specific

The geologist’s chisel is a tool of revelation through decisive impact. You see a rough, unremarkable stone. You have a hypothesis—a shape, a fossil, a seam of crystal—locked within it. Your job is to strike, with sharp, deliberate blows, to split the matrix and expose the specific truth hidden inside. The waste material falls away in chunks. The work is binary: either you hit the right plane and the stone cleaves cleanly, revealing your prize, or you don’t and you must reassess your angle.

In our work, this is the mode of the ruthless edit, the ‘kill your darlings’ mandate. It’s opening a dense, meandering report and, with a few targeted deletions of whole paragraphs, finding the core argument suddenly laid bare. It’s looking at a cluttered workflow and abolishing an entire step, not tweaking it. The chisel is for when you know, or strongly suspect, what the finished form should be. Your energy goes into the precision and courage of the strike, trusting that what remains is the essential thing.

The potter’s rib, by contrast, is a tool of gentle, continuous erosion. Made of wood or flexible metal, it’s used on the spinning wheel to smooth, shape, and refine the walls of a vessel. The potter doesn’t know the exact final thickness; they feel for it. They apply steady, even pressure, shaving away microns of soft clay with each pass, constantly sensing the form emerging through their fingers. The material removed is a slurry, almost indiscernible. The goal isn’t to expose a pre-existing object, but to guide a malleable one toward its best possible shape.

This is the mode of incremental refinement. It’s rewriting a sentence not by deleting it, but by paring back three adjectives and softening a verb. It’s streamlining a daily routine by shaving five minutes off a meeting, then consolidating two similar tasks, then quietly dropping a low-value notification—a process of constant, gentle friction against the excess. The rib works where the final form is emergent and sensitive, where too forceful a cut would collapse the whole structure.

The trouble comes when we use the wrong tool for the job. Chiseling at a spinning, half-formed idea will shatter it. Conversely, trying to rib away a massive, solid block of procrastination or a granite-hard bad habit is futile; it requires a decisive strike. The most productive subtractors, I think, are the ones who learn to diagnose their material. Is this a dense stone concealing a clear shape? Reach for the chisel. Is this a soft, spinning mass of potential that needs guidance? Pick up the rib. Both clear the way forward, but one does it with a crack of clarity, the other with the whisper of a finishing touch.

Notes & further reading

A few pages I came back to while writing this: