Bulging Line Op-Art Illusion

Is this paper flat? You might question if these lines are popping of the page but it’s just an illusion, a trick of the eye. They looked at the art of Bridget Riley and Victor Vasarely. These two were very awesome artists from the Op-Art Movement, a time in art history where many artists made pictures that tricked your eyes. Now look close at these pictures to see how Line and Value (also known as Shading) are used to make everything look round!