Laws of UX · Perception and grouping
Von Restorff Effect
When multiple similar objects are present, the one that differs from the rest is most likely to be remembered.
The design-system take
Where the principle shows up in a token, component or pattern decision.
One accent colour on a screen of neutrals is a feature; accent colours everywhere cancel each other out. Differentiate deliberately — the exception is what gets seen.
Adapted from Von Restorff Effect on Laws of UX — Jon Yablonski.