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"We have data showing that the proportion of people that can flip has increased over time." The dress has been so consequential to our understanding of the science of color perception that it has added to the body of evidence answering a question dating all the way back to the great philosopher Immanuel Kant, who in the 18th century theorized humans can never really know if they see color the same way, as they can't literally see through someone else's eyes

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