As one of the abstract styles developing in the 1960s, Optical illusion (or Op) Art features games of lines and geometric shapes in both black and white—like in the case of Bridget Riley, Jesús Rafael ...

Artists and scientists have been creating optical illusions for centuries. Here are 35 mind-bending examples that prove you ...

The Terrell-Penrose effect, predicted in 1959, suggests that objects moving at speeds close to that of light appear rotated.