A seemingly silly argument over the color of a dress sparked countless discussions on social media that spilled over into questions of psychology, biology, and physiology.
It all started when a young woman named Caitlin McNeil posted a picture of her mother's dress for her daughter's wedding - and asked netizens what they thought the colors of the dress were.
Most of the surfers answered that they could see the colors white and gold, but then it turned out that some also saw the colors blue and black.
The image quickly spread across the internet and reached leading news sites.
It turns out that the millions of surfers (over two million) were divided into two main camps: the central group of 1.6 million - who see the colors gold and white, and 29 percent who identify the colors blue and black.
And what are the real colors? A search online revealed: The minority group was right. The original dress is painted blue and black.
What is the reason for the millions' mistake?
Eye research experts explain that the structure of the eye changes over the years, and thus there are differences between the eye of an older person and the eye of a younger person in the perception of colors and wavelengths of light coming from objects.
Another difference is the lighting conditions.
It turns out that when an object appears on a background of a certain color, the eye is 'tricked' and tends to see the same object in the background colors behind it.
The famous dress image joins other images belonging to the 'optical illusion' series, known from the field of psychology and brain tricks.
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