David Marr's Theory of Vision proposes that visual perception occurs through three distinct levels of processing: the computational level, the algorithmic level, and the implementational level. The computational level defines the problem of vision, focusing on what the visual system needs to achieve, such as recognizing objects. The algorithmic level describes the processes and methods used to solve this problem, while the implementational level addresses how these processes are physically realized in the brain. Marr emphasized the importance of understanding vision as a complex information-processing task. He introduced the concept of a "primal sketch," which captures basic visual features like edges and textures, serving as the foundation for higher-level visual understanding. His work has significantly influenced fields such as cognitive science, neuroscience, and artificial intelligence.