Optical Illusion: Does this black heart keep getting bigger or staying still?

In this optical illusion created by Gianni A. Sarcone, Courtney Smith, and Marie-Jo Waeber, one can see an illusionary black heart in the centre against a black and white background.   | Trending

21st century advances in art: optical illusions

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Sometimes, I look at a bright light. After I look away and blink, I still see shapes (shadows). What is this called? - Quora

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