Windows have long held an ambivalent role in architecture, as they both define and enclose interiors while simultaneously creating a link to the outdoors. This dual function goes beyond simply meeting construction needs or providing daylight, directly influencing how occupants experience and engage with the views. The 20th century saw the introduction of materials such as steel, aluminum, and glass, which enabled different types of windows with thinner frames and expansive panes, enhancing transparency and reinforcing the visual connection with the surrounding setting.
American architects such as Frank Lloyd Wright and Philip Johnson explored these possibilities to harmonize architecture with landscape. In Fallingwater House, windows and terraces seamlessly connect the house to the waterfall and surrounding forest, whereas the Glass House's minimal framing nearly dissolves the boundary between interior and exterior, bringing the natural environment to life inside the house. Through its evolution, windows have become an element that unites space, materials, and perception, opening new pathways for exploring the relationship between architecture and its environment.
