For the record, the dress is definitely black and blue. But it appears white and gold to some people due to a phenomenon called color constancy and the way that our brains interpret colors.

Almost half of the world ... including brown, green, blue, yellow, red, black or white. Communication is an important reason behind these color changes. With color, chameleons can communicate ...

The two brands have much to offer - including this deep blue colourway. As seen here in the Align leggings, the colourway is so dark it's almost black, easily hiding sweat post-workout.

You may have heard of these wavelengths shortened to ROYGBIV, which stands for red, orange, yellow, green, blue, indigo, and violet. A red object looks red because ... to see if the inks separate. So, ...