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If your brain concludes that the image is illuminated by a cool source, like a blue sky, youll ignore the blue wavelengths of the visible light spectrum and determine that the dress is white and gold

Formal dress

Although, of course, theyre made from smarter fabrics including cotton and wool, making them look, from the outside at least, like a regular pair of tailored trousers

Heres how to see both colors I spent five minutes trying to figure out how people saw black and blue

Fit-and-flare silhouette

In the survey, time of day seemed to make a modest difference to these assumptions, but still, the fundamental reasons why we come to make different inferences about the lighting remains largely unknown