"Lithophane "the Declaration" Cira 1850"
Lithophane numbered 610 Dimensions: 11 x 13 cm Gallant scene: at the feet of his beautiful, a young elegant man declares his love. A lithophanie is a thin ceramic plate with a relief whose thickness varies from 1.5 to 4 mm. The porcelain is fired twice at a temperature of 1250 ° C. In normal lighting, there is practically no visible image, but a three-dimensional image is created when a light is placed behind it. Lithophanes became particularly popular in the mid-19th century. Placed in front of a candle, they served as a bedside lamp or were hung in front of a window.
https://www.lavalisearlesienne.com/product-page/lithophanie-la-d%C3%A9claration