Blue and black or white and gold? A decade later, it turns out the ultra-viral optical illusion dress was also a boon to scientific advancement.

Optical illusions are fascinating visual phenomena that trick the brain into perceiving something different from reality.

This is because the image is bistable, similar to the famous Rubin vase illusion. Known more colloquially as the vase-face optical illusion, Rubin's vase can be seen as the black profiles of two ...

They are captured singing and playing, in a fleeting moment of tenderness. Now a pair of unusually intimate portraits by 17th century Dutch master Frans Hals are on public sale – if you have at least ...