Blue-black or white gold?

Blue black or white gold?

Spoiler: It’s blue – black.

If you’ve been on the internet over the past few days you have no doubt seen the offending dress – and developed an opinion on what colour it is.

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So why the confusion over such a simple dress?

It comes back the way your brain processes light – when light enters your eyes it passes through a lens, with different wavelengths corresponding to different colours. The light then hits the retina in the back of the eye where pigments fire up the neural connections to the visual cortex – the part of your brain that processes those signals into an image.

However the key part in how you see the dress starts with the first burst of light – made up of whatever wavelengths are illuminating the world, reflecting off whatever you’re looking at. Your brain works out the colour that the light is bouncing off the thing your eyes are looking at and subtracts that colour from the real colour of the object.

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If you are interested in a more detailed write up click here