Which architectural luminary is commonly installed in ceilings?

Recessed lights are a popular choice for ceiling installation due to their sleek, discreet design that allows for a clean aesthetic in any space. These lights are embedded within the ceiling, providing a streamlined look that eliminates bulky fixtures, making them ideal for modern interior design. The installation occurs in the ceiling structure, which helps to create a more open and airy feel in a room.

Recessed lights serve various lighting purposes, including ambient, task, and accent lighting, making them adaptable for different areas, such as kitchens, living rooms, and galleries. Their ability to focus light downward allows for effective illumination of specific areas while minimizing glare and shadows, enhancing the overall functionality and mood of a space.

Other types of lighting, such as floor lamps, wall sconces, and portable lamps, are designed for different applications and configurations, typically situated away from the ceiling, which is why they wouldn't fit the context of this question regarding ceiling installations.