Some optical illusions require creative talent. You have to draw spirals, and pick the right colors, or at least have the ability to make two faces in profile look like one vase. Not these two ...

Artist James Nolan Gandy invents robot arms that sketch intricate mathematical shapes with pen and paper. When viewed in real time, the effect is impressive. But it becomes even more so when the ...

Sometimes the simplest illusions are the best. A simple trick makes a sketch of a cube appear to float and twist in the middle of a sketch pad. This optical illusion is completely inexplicable when ...