Hollow-Face: Concave Mask Appears Convex

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Curated archive entry based on published research. A concave face mask is often perceived as a normal, outward-facing face, even when viewers know the mask is hollow. This describes a documented perceptual effect under the cited conditions, not an independent personal report or evidence that the underlying physical measurements changed.

SOURCE: https://pmc.ncbi.nlm.nih.gov/articles/PMC4097071/

TAGS: #curated #publishedresearch #perception

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