Why did Cubist artists reject Renaissance perspective?

Cubist artists, including Pablo Picasso and Georges Braque, rejected Renaissance perspective because they sought to break away from the tradition of using art to imitate nature through illusion.12

While Renaissance artists utilized perspective to create the illusion of a "window to the world," Cubists aimed to present a new kind of reality on the flat, two-dimensional surface of the canvas. By rejecting traditional techniques like foreshortening, modeling, and chiaroscuro, they sought to emphasize the structure of form itself.123

Instead of providing a single, limited view of an object, Cubists depicted multiple perspectives simultaneously on the same picture plane. This approach allowed them to convey more information about an object’s form and its position in space than a traditional illusionistic view could provide. Ultimately, they viewed their work as an independent reality, where meaning resided in the geometric structure and the treatment of the subject rather than in the credible imitation of the physical world.24