laws & principles
Gestalt: prägnanz
What is the Gestalt law of prägnanz?
Prägnanz - the law of good figure, or simplicity - is the mind's pull towards the simplest, most stable reading of what it sees. Faced with something ambiguous, you perceive the cleanest interpretation: a few whole shapes rather than many odd ones.
Also known as: law of prägnanz, law of good figure, law of simplicity
The demo
Two circles overlapping - obviously. But the very same drawing is also three separate, odd-shaped pieces. Switch the view and notice which one your mind simply will not reach for first.
Two whole circles overlapping - the simple, stable reading your mind settles on instantly.
What this demo shows (text version)
Two circles overlap. Read simply - and almost everyone does - the figure is two complete circles, one partly in front of the other.
The alternative view fills the three areas the overlap actually creates: a left crescent, the lens-shaped middle where the circles meet, and a right crescent, each a different colour. That description is just as accurate, yet it feels strained, because the mind insists on the simplest, most regular structure available - two whole circles. That insistence is prägnanz.
You saw two overlapping circles, not the three separate odd-shaped regions the same drawing could just as truthfully be. The simpler reading wins on its own, because that is the one the mind is built to reach for.
Prägnanz sits underneath the other Gestalt laws: closure, continuity and the rest are all the mind choosing the simplest available structure. It is why clean, regular layouts feel effortless - they hand the eye the simple reading it was going to prefer anyway.
Push against it and you pay. An interface that can be read two ways forces the mind to do extra work resolving the ambiguity, and it often resolves it the wrong way. Designing with prägnanz means making the simplest reading also the correct one.