This project originates from the widespread phenomenon of bird fatalities caused by collisions with glass curtain walls. By examining the history of bird-themed video games and avian science, it investigates the deeper causes behind this issue. Building on this foundation, the project uses extended perception-bridging the digital and physical worlds-as a design approach, and adopts a “game” (simulator) aimed at contemporary architects as its medium. In doing so, it offers architects-the original authors of buildings-a way to sense architecture as birds do, thereby improving the relationship between humans, buildings, and nature.