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Vagelis Plevris

Vagelis Plevris⁠

Structural engineer, professor and science communicator exploring engineering, mathematics, AI and science through clear, useful and engaging stories.

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The Dress That Divided the Internet: Why Our Brains See Different Colors

In 2015, millions of people looked at the same photograph and saw different colors. The science behind the disagreement reveals how our brains construct what we see.

17 min readOct 20, 2026

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Look carefully at the photograph below.

What colors do you see? Blue and black? Or white and gold?

The original 2015 photograph of a fitted dress with horizontal lace bands, appearing pale blue and brownish-gold under ambiguous lighting, which viewers variously perceive as blue and black or white and gold.
The original photograph that sparked the worldwide debate in February 2015. Viewers disagreed over whether the dress appeared blue and black or white and gold. Photograph by Cecilia Bleasdale, 2015. © Cecilia Bleasdale. Source: Wikipedia.

Before reading any further, make your choice. Don’t try to analyze the lighting or guess what the correct answer might be. Just look at the dress and decide what colors you see.

Now, if someone is nearby, show them the same photograph. Don’t tell them what you see. Simply ask them to describe its colors.

You might agree. But you might also discover something rather strange: the person sitting next to you could be looking at exactly the same image and seeing a completely different combination of colors.

In February 2015, this seemingly trivial question became an international sensation. Friends argued with friends. Couples disagreed. Celebrities joined the debate, and millions of people took sides. Within hours, a photograph of an ordinary dress had become one of the most widely discussed images on the Internet.

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Structural engineer, professor and science communicator exploring engineering, mathematics, AI and science through clear, useful and engaging stories.