Blast from the Past: Can You Name These 20 Forgotten Retro Household Items?
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What Victorian-era optical toy let you view double cards to create a 3D stereoscopic image?
Explanation
A stereoscope was an early ancestor of modern 3D and VR gear. Popular from Victorian times into the 20th century, it used dual lenses to view cardboard stereographs containing offset side-by-side images, combining them into one stunning 3D scene.