What defines a "flat ceiling"?

A "flat ceiling" is defined as a continuous ceiling that exists in a single plane. This characteristic implies that the ceiling does not have any slopes, recesses, or varying heights, giving it a streamlined and uniform appearance across the entire space.

In construction and design, flat ceilings are often preferred for their simplicity and ease of installation. They provide an unobstructed surface that is ideal for a variety of functional and aesthetic applications, including the installation of lighting fixtures and sprinkler systems. A flat ceiling typically adheres to traditional design principles, making it a versatile choice for residential and commercial environments.

The other options describe different ceiling types or characteristics. Ceilings with multiple levels introduce complexity and architectural interest, while decorative recessed ceilings focus on stylistic elements that enhance the visual appeal. An adjustable ceiling suggests a functional variability that is not consistent with the stability implied by a flat ceiling.