The Dress that Launched a Thousand Questions

The most asked question this week was "What color is this dress?" Initially to me, it was white and gold and then when I checked back later on in the day, it was black and blue. What is up with that? Basically, it has something to do with our photoreceptors or the cells in our eyes that control our day, night and peripheral vision, as well as our color perception.
When light enters our eyes, these receptor cells convert these wavelengths of light into electrical signals that are sent to the brain. Our brains then determine the color we are seeing. Now the differences in color perception all depends on how our brains are interpreting the light that comes into our eyes. This explains why early in the day, it appeared white and gold and later on at night, it showed its true colors, black and blue.

This informative video can explain more: 

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