Konubinix' opinionated web of thoughts

Lithophane

Fleeting

lithophane is a thin plaque of translucent material, normally porcelain, which has been moulded to varying thickness, such that when lit from behind the different thicknesses show as different shades, forming an image. Only when lit from behind does the image display properly

https://en.wikipedia.org/wiki/Lithophane

LithoBulb - Create 3D Printable Lithophane Bulbs

Image to Lithophane

To 3D print a lithophane, using white filament