Irreducibility

Designers are often told to make things “as simple as possible but no simpler,” but how much can you remove before a system stops doing what you need it to do? The answer depends on the function or meaning you want to preserve. A feature that is essential for one purpose may be dispensable for another.

Albert Einstein expressed the demand for economy in a theory: “It can scarcely be denied that the supreme goal of all theory is to make the irreducible basic elements as simple and as few as possible without having to surrender the adequate representation of a single datum of experience.” Simplification must still account for the observations the theory is meant to explain.

Some properties depend on interactions among parts. A chess game, for instance, involves moves, rules, and players responding to one another; a list of physical pieces does not describe the game. What feels like “magic” often depends on these relationships. Studying individual parts remains useful, but it can miss what happens when they work together.

Typography and Design

Designers must decide which characteristics make an object, interface, or symbol recognizable and useful. Eric Gill, in his 1931 book An Essay on Typography, observed:

“Letters are not pictures or representations. They are more or less abstract forms.… A Roman capital A does not cease to be a Roman capital A because it is sloped backwards or forwards, because it is made thicker or thinner, or because serifs are added or omitted; and the same applies to lowercase and italics.”

A designer can vary a letter’s weight, slope, and ornament while keeping it legible. Context also matters. Gill noted that a rounded square might suggest an O on its own, yet be difficult to distinguish from a D drawn with similar roundness. Recognition depends partly on the surrounding characters.

Paul Felton applies this reasoning to typographic conventions. For a headline, the requirement is not necessarily “larger” or “at the top”—it is that readers notice it at the intended point. Contrasting color, bold type, or an unusual position may achieve that purpose. Understanding the requirement gives the designer room to experiment with its implementation.

Limits on What Can Be Changed

Warren Buffett’s baby analogy concerns a different limit: nine women cannot produce a baby in one month. Adding resources cannot compress every process in proportion to the resources added. Before trying to accelerate a process, identify which steps can run in parallel and which require time in sequence.

The fable of the goose that laid golden eggs illustrates the danger of destroying a productive system while trying to extract its output. Impatient with a daily egg, the farmer cuts the goose open and loses the source of future eggs. The story is an analogy for preserving the relationships and conditions that make a capability possible. In a real system, the work is to identify those dependencies before removing parts or changing their connections.