A viral optical illusion has sparked debate on Twitter as people disagree on which number is hidden within a black and white ...

Op Art, also known as optical art, is a type of art that features optical illusions ... waves, circles and checkerboard patterns. Often these are produced in black and white or highly contrasting ...

(Rhythm Rathi/CBC) Ji Hyang Ryu said it took her about two weeks — and two litres of black paint — to turn the white walls into an artistic illusion. She said it was her first time working on ...