Op Art, short for Optical Art, is characterized by its use of optical illusions and visual effects to create a sense of movement, depth, or vibration in the artwork.

Victor Vasarely is widely regarded as a pioneer of Op Art. His works, such as "Zebra" and "Vega", are known for their bold patterns and striking visual effects.

Moiré patterns are created by overlaying two or more grids or patterns at slight angles, resulting in an illusion of movement or vibration.

Bridget Riley's "Current" is an iconic Op Art piece that uses concentric circles to create an illusion of depth and movement.

Op-Lines is a technique in Op Art that involves creating patterns with alternating black and white stripes, often resulting in an illusion of movement or vibration.

Yayoi Kusama is known for her Op Art works that explore the concept of infinity, such as her "Infinity Mirrors" and "Polka Dots" series.

Op-Curves is a technique in Op Art that involves using curved lines and shapes to create an illusion of three-dimensionality.

Sol LeWitt's "Wall Drawing #122" is an example of Op Art that uses a grid pattern to create an illusion of movement.

Op-Dots is a technique in Op Art that involves using repeating geometric shapes, such as dots, to create an illusion of movement.

M.C. Escher is known for his Op Art works that explore the concept of perception and reality, such as his "Relativity" and "Ascending and Descending" prints.

Op-Colors is a technique in Op Art that involves using contrasting colors to create an illusion of depth.

Bridget Riley's "Black and White Stripes" is an example of Op Art that uses a combination of black and white stripes to create an illusion of movement.

Op-Chaos is a technique in Op Art that involves using irregular shapes and patterns to create an illusion of chaos and disorder.

James Turrell is known for his Op Art works that explore the concept of light and shadow, such as his "Roden Crater" project.