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similarity-grouping

Use visual similarity to create perceptual groups — making related items look alike so users perceive them as a set. Use when designing lists with categorized items, navigation systems, status displays, dashboards with multiple data series, or any layout where you want users to see "these things go together" at a glance. The strongest grouping cues, in order, are color, size, shape, and orientation; combine multiple cues for the strongest grouping.

plugins/HDeibler/universal-design-principles/plugins/perception-and-hierarchy-principles/skills/similarity-grouping/SKILL.md

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# Similarity — grouping

When you want users to perceive a set of items as belonging together — as a category, as related, as the same kind of thing — visual similarity is the most direct way to communicate it. Two items styled the same way are perceived as a pair; ten items styled the same way are perceived as a set; an entire list styled consistently is perceived as a category.

## Core grouping techniques

**Same color.** The strongest grouping cue. All "active" items in one color; all "inactive" items in another. All items in a category share a color tag or background tint.

**Same size.** Items at the same visual scale group. All section headings at the same size; all body text at the same size; all icons at the same size.

**Same shape.** Items in the same shape group. All cards have the same proportions; all buttons have the same corner radius; all icons share a stroke style.

**Same icon or symbol.** Items marked with the same icon group. All "important" items get a star; all "deletable" items get a trash icon visible on hover.