Photographs Hidden In Plain Porcelain

A lithophane is a plain slab of porcelain that hides a detailed three-dimensional image. It only reveals its hidden picture when you shine a light through it from behind.

These 19th-century marvels use varying thicknesses of material to create a grayscale effect. Thick areas block light to form shadows, while thinner parts glow brightly. It is essentially an analog version of a digital photograph, relying entirely on light transmission rather than surface paint. You can still find them today as decorative lamps that look like boring white tiles until the bulb turns on.