simpligon

A simpligon is a theoretical construct used in discussions of modular design and simplification in systems theory and related disciplines. It denotes a small, atomic unit of a model, process, or specification that is designed to be as simple as possible while retaining the capacity to participate in larger assemblies without altering emergent behavior. Simpligons are intended to function as building blocks that can be composed, substituted, or decomposed while preserving the system’s essential properties.

The term combines simple with the suffix -gon, chosen to evoke a minimal, well-defined building block. There is no single formal definition, and usage varies across disciplines.

A simpligon is typically described as having a bounded interface, well-specified inputs and outputs, and a defined scope of responsibility. When two or more simpligons are composed, the aggregate should preserve the functional specification at the chosen level of abstraction. In many sketches, simpligons are idealized to avoid hidden side effects during composition.

Applications include theoretical discussions of modular design, teaching tools for abstraction, and problem-solving thought experiments about reducing complexity to minimal interacting components.

Variants include primary simpligons (core units) and generalized simpligons (parameterized or layered units). Critics note that the lack of formal consensus can make the term vague and encourage confusion with existing concepts such as modules, components, or abstractions.

See also: Modularity, compositionality, abstraction, system design.