People who get up early tend to see the dress as white and gold, because their mind is used to resolving ambiguous colors using the context of early morning lighting.
People who stay up late tend to see it as blue and black (the true colors), because their mind is used to resolving ambiguous colors in the context of evening indoor lighting.
Oh hey, I just listened to a thing about this!
What we can learn about perception, priors, and truth itself from the party dress that sparked a global debate over the nature of reality
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tl;dl
People who get up early tend to see the dress as white and gold, because their mind is used to resolving ambiguous colors using the context of early morning lighting.
People who stay up late tend to see it as blue and black (the true colors), because their mind is used to resolving ambiguous colors in the context of evening indoor lighting.