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It's the exact same thing as bloody Mary. It's called the Troxler effect, and what's happening is that your neurons are canceling out information that is constant, that way we won't go stark raving mad from constantly thinking about what our toes feel. As you stare ahead motionless your reflection and your view of it are constant, and so your brain starts canceling out the visual input from parts of your face, thus producing trippy distortions.
That this uses two mirrors changes nothing.
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