Hidden for 175 years: Photographer's mysterious "witch mirror" 3D self-portrait emerges
In 1847, French photography pioneer Charles Nègre created a 3D self-portrait using a "witch's mirror" — a clever piece of 19th-century surveillance technology. These convex mirrors, popular in homes and businesses since the 1500s, let owners monitor entire rooms from a single vantage point without turning their heads.
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