A plane in art represents a flat surface within a composition which is often defined by boundaries that separate different elements or areas. The plane functions as a fundamental component that organizes spatial arrangements while establishing visual connections among objects and shapes. Artistic planes exist as two-dimensional surfaces but gain depth through shading and perspective techniques and other methods. The notion of the plane has played a critical role throughout different movements and styles in the history of art. Renaissance artists such as Leonardo da Vinci used planes to create depth and realism in their artworks. Pablo Picasso and Georges Braque led the Cubist movement which transformed spatial representation through geometric plane dissection and simultaneous multiple perspectives. Current artists experiment with plane concepts to expand artistic limits and question established representation methods. Op art creator Bridget Riley utilizes planes to generate optical illusions and dynamic visual effects through her artwork. Ellsworth Kelly's minimalist art pieces use bold flat color planes that work together to produce a balanced and harmonious effect. A thorough comprehension of the plane's function within art is necessary to fully appreciate the complexity and depth that visual compositions bring to an artwork. Viewers who understand artists’ techniques of manipulating planes to create meaning and impact can develop deeper connections with artworks from various stylistic periods.