Looking for a kind of light, maybe you have seen it and can help me.

There are many lamps with this effect, rotating lamps in dance halls, sign lamps in hairdressing salons, laser projection lamps, and a kind of rotating spherical star mirror lamp, which doesn't emit light itself and relies on the reflection of other light to form an effect, called a ghost lamp.

The simplest and most effective is the traditional horse lamp, relying on the temperature of the bulb, the formation of hot air flow to promote the upper blade, so that the inner shade rotation, if the inner shade only by carving the empty space to project the light, you want to have the effect.