A printed moon lamp and a photo sphere are not the same thing
Most moon lamps sold online are a moulded shell with a lunar surface texture and a light inside — attractive, but identical to every other one shipped from the same factory. A photo sphere is a different object entirely. Your photograph is etched into the curvature itself as varying wall thickness, so the image is physically sculpted into the globe rather than printed onto it. Switched off it reads as a plain white sphere with a faint relief. Switched on, the light passes through thin areas and is held back by thick ones, and the picture resolves out of the surface. Nothing is printed in ink, which is why it will not fade.
Which photographs wrap well onto a curve
A sphere is more demanding than a flat panel, and being clear about that saves disappointment. A single subject with clear separation from the background works beautifully — a portrait, a couple, a child, a pet. What struggles is a wide group shot, because the curvature stretches the edges and faces near the poles distort. Bright, high-contrast images with real light and shadow reproduce best; dark or heavily filtered photographs have little tonal range for the thickness variation to work with. The happiest results usually pair one strong face with an open background such as sky, water or foliage, which wraps around the rest of the globe as texture.
Where it belongs in a room
A sphere throws light differently from a flat lithophane. A panel projects forward and works as a framed picture that happens to glow; a globe radiates in every direction and behaves like a lamp that happens to carry a photograph. That makes it a better fit for a bedside table, a console or a shelf where it will be seen from several angles, and a poor fit for a spot where it will only ever be viewed head-on. It is also the piece people pick up, which is worth considering — the weighted base matters as much as the sphere.
