What is the fine-grained topic of the following text: A virtual time capsule, the room is filled with objects that will be nostalgic for some but which many others will find unfamiliar and even exotic, including the Underwood typewriter, a Poloroid Land Camera, an adding machine, clock radio, and other streamlined, mass-produced objects from the midcentury. Only return the topic.
Midcentury nostalgic and obsolete objects