What feature allows natural light to enter a room but remains fixed?

The feature that allows natural light to enter a room while remaining fixed is best represented by a fixed window. Fixed windows are designed to provide unobstructed views and ample natural light without the functionality of being opened or closed. They are typically made from large glass panes and are installed in various architectural designs to capitalize on scenic views and sunlight.

In contrast, other types of windows, such as casement, awning, and double-hung windows, include operational mechanisms that allow them to open for ventilation purposes. While these window types can also let in natural light, they don’t serve the same fixed function as a fixed window, which is solely concerned with illumination and visibility. Thus, fixed windows are unique in their design, as they prioritize natural light without a feature for opening or closing, making them the right answer for the question posed.