Why did some people see a gold and white dress?

See the BLUE/BLACK: Flip the Dress Colors! (Original dress slowly fades in)

The Dress - Explained. (White and Gold or Black and Blue)

What is the color of the dress?Blue and black or white and gold?

How to see The Dress BOTH ways (Black & Blue or White & Gold)

The Dress Debate SETTLED: Black And Blue - Or White And Gold?

The White-Gold vs. Blue-Black Dress Debate

Is it white and gold or black and blue? #shorts

Is this dress yellow and gold or blue and black?!

The Dress: White or Blue? Photoshop Lightroom PROOF!