06 · Seeing
Law of Prägnanz
People read a complicated image as the simplest shape it could be, because that takes the least effort.
Evidence: Holds, with limitsWhat we do with it
- 01
Simple shapes are recognized faster and remembered longer.
- 02
If a layout can be read two ways, people pick the simpler one. Make sure that's the one you meant.
- 03
An icon should still read when you squint at it.
Examples
Getting it wrong, getting it right.
Don't
An icon of overlapping shapes that only makes sense at full size. At 16 pixels in a browser tab it becomes a smudge.
Do
A mark made of one or two plain shapes, checked at 16, 32 and 512 pixels before it ships.
The evidence
What the research says.
That people favor simple readings of a shape is well supported. What counts as “simplest” is not: a century on, researchers still disagree on how to define and measure it, which makes the law hard to test head on.
Sources
- Wertheimer, M. (1923). Untersuchungen zur Lehre von der Gestalt II. Psychologische Forschung, 4.
- Wagemans, J., Feldman, J., Gepshtein, S., Kimchi, R., Pomerantz, J. R., van der Helm, P. A., & van Leeuwen, C. (2012). A century of Gestalt psychology in visual perception: II. Conceptual and theoretical foundations. Psychological Bulletin, 138(6).
Last reviewed November 7, 2026. How we keep this current