Everyone sees this optical illusion differently. Does the outline look red or blue to you?

What is the colour of the outline - blue or red?, Viral News, Times Now

Is this BLUE or GREEN? There's a new optical illusion frustrating the web

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This legs optical illusion is causing a new 'blue and black dress' style debate - what do you see? - Irish Mirror Online

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Everyone sees this optical illusion differently, so does the outline look red or blue to you?