Why did Masaccio’s paintings make viewers feel as if they were looking through a window into a real world?

Masaccio’s paintings created the illusion of a window into a real world by breaking away from the arbitrary physical laws of the Middle Ages and instead applying the same principles of space, light, and form that govern reality.1

He achieved this through several key techniques:

• Linear Perspective: Masaccio utilized the one-point perspective system, which uses a vanishing point and converging lines to create a convincing sense of depth and distance on a flat surface.23
• Consistent Lighting: Unlike earlier styles, his work featured a consistent fall of light that matched the natural light of the environment where the paintings were displayed, such as in the Brancacci Chapel.13
• Anatomical Realism: He rendered figures with sculptural solidity and volume, using light and shade to give them a three-dimensional appearance.13
• Rational Space: By creating a clearly articulated, rational space, he allowed the viewer to perceive the painting as a continuation of their own world, where the figures act as purposeful human participants.13

These innovations established a new standard for naturalism in Renaissance art, fundamentally changing how artists represented the human experience.43