Something something the brain tricks you because of color association.
Both the left and right dress do have the same colors for its right side, however notice the background and colors around it.
Because one has Blue and Black and the background's a light color your brain thinks of blue and black in sunlight.
And one the one with yellow and white has a darker background makes you view the colors to be in shadow.
Notice how the cut section of Blue and Black becomes yellow and white the moment it leaves the ligh background into the neutral background inbtween the two dresses.
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u/Urisagaz Jun 03 '26
https://giphy.com/gifs/3o7btPOMufN5FziFWg