closure

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# Closure

> **Definition.** Closure is the Gestalt principle that the visual system tends to perceive incomplete shapes as complete — to "close" gaps in outlines and recognize implied forms. A circle with small breaks in its outline is still seen as a circle. A few strokes that suggest a face are perceived as a face. Negative space between objects can imply a third object that isn't actually drawn. The brain fills in what isn't there.

The classic Gestalt demonstrations of closure use simple shapes with strategic gaps. A "circle" made of 12 dot pairs around its circumference reads as a circle, not as 24 dots. A "triangle" formed by three Pac-Man-shaped figures (the Kanizsa triangle) is perceived clearly even though no triangle is actually drawn — only the gaps imply one.

This perceptual tendency has substantial design value. It lets you communicate forms with less visual information than would be needed to draw them fully. The result is interfaces that feel light, illustrations that feel modern, logos that work at many sizes, and visual cues that work even at minimum scale.

## Why closure matters

Closure does several useful jobs in design:

**Visual economy.** A form suggested by a few strokes is faster to read than a fully-rendered form, and it scales better — a partial shape can communicate at sizes where a fully detailed shape would be a blur.