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Gestalt: closure 0:29
A 29-second explainer of Gestalt: closure, narrated over the same demo you can try yourself.
Try the interactive Gestalt: closure demo
What this video covers
Closure is the mind’s tendency to fill in gaps and complete shapes from incomplete visual cues - perceiving a whole circle, triangle, or icon even when only fragments are shown.
There is no triangle on the screen - only three notched circles. Your mind drew the edges itself, and so confidently that closing the gaps is the very thing that makes the triangle disappear.