Bevil Conway

This dress was very carefully crafted, either by accident or design, for a combination of colors that doesn’t resolve unambiguously.

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What's happening here is your visual system is looking at this thing, and you're trying to discount the chromatic bias of the daylight axis, so people either discount the blue side, in which case they end up seeing white and gold, or discount the gold side, in which case they end up with blue and black.