Which side is which? How the brain perceives borders

In the classic Rubin’s vase optical illusion, neurons in the brain must decide whether the border between black and white belongs to the white area or to the black area, which determines whether you perceive the scene as either a black vase on a white background, or white faces on a black background. Credit: Talking faces by solsken CC BY-NC-SA 2.0

In the classic “Rubin’s vase” optical illusion, you can see either an elaborate, curvy vase or two faces, noses nearly touching. At any given moment, which scene you perceive depends on whether your brain is viewing the central vase shape to be the foreground or background of the picture.

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News Source: https://medicalxpress.com/news/2021-11-side-brain-borders.html