What color is this dress?

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(PIX11) -- There's a lot of controversy surrounding this dress.

For some bizarre reason, half of us see it dress as white and gold, and the other half sees it as blue and black or charcoal grey.

Some have said the dress first appears to be white and gold, then switches to blue and black and vice versa.

Bob Gross, an engineer at PIX11, offered this explanation for the photo:

The dress is black and royal blue in reality. The Tumblr picture appears to be some sort of optical illusion.

The dress is apparently a black and blue sheath dress. (Photo: Amazon)

The dress is apparently a black and blue sheath dress. (Photo: Amazon)

Roman, the company behind the dress is even getting in on the fun, playing on the new fame.

The company has changed their Facebook cover photo to two photos of the dress in both colors. They're also using the hashtag #thedress that has been trending on Facebook.

What do you see? Chances are the person sitting next to you has a different answer.

Some have said the dress first appears white and gold, then switches to black and blue.

Some have said the dress first appears white and gold, then switches to black and blue.