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Gestalt: proximity vs common region 0:42
A 42-second explainer of Gestalt: proximity vs common region, narrated over the same demo you can try yourself.
Try the interactive Gestalt: proximity vs common region demo
What this video covers
Proximity groups items by how close they are; common region groups them by sharing a boundary or background, and can override spacing.
Same four dots, same distances - but draw a line around the two that sit farthest apart and they snap into a pair, overruling the spacing entirely. That is the order of power: a boundary beats nearness.