Final answer:
An upholstered platform is not necessarily metal and can be made of various materials such as wood, plastic, or metal depending on the design and intended use.
Step-by-step explanation:
An upholstered platform is not necessarily metal. The material of an upholstered platform can vary depending on the design and the intended use. While metal platforms are commonly used in modern furniture design, such as the chrome plated tubular steel used in Marcel Breuer's armchair, upholstered platforms can also be made of wood, plastic, or other materials.
For example, a bed platform can be upholstered with a fabric or leather covering, providing a comfortable and stylish surface for sleeping. This platform can have a wooden frame or a metal frame, depending on the specific design and desired aesthetic.
Therefore, it is important to consider the specific context and design of the upholstered platform in question to determine whether it is metal or not.