Blast from the Past: Can You Name These 20 Forgotten Retro Household Items?
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What optical machine carousel projected photographic slides onto a living room screen for family slideshows?
Explanation
A slide projector (often with a circular rotary tray carousel) was a popular mid-century living room icon. It let families display travel or vacation photos by projecting bright light behind cardboard-mounted 35mm film slides onto a wall or screen.