>>15682738The schist disk was originally thought to be a candle/incest holder. The one in
>>15682722 is a modern reproduction. It could be an impeller for a water pump, and it technically works as one(modern reproductions of the geometry have been made and put into custom housings with modern motors spinning at 2,000+rpm ), but for it to be practical it would need considerably higher speeds than possible without gearing down known power sources at the time, and it is practically useless considering complexity of the geometry when much simpler arrangements work much more efficiently.
There are other incredibly elaborate incense holders, It's just a piece of Egyptian modern art and/or proof of autism being a thing for as long as humanity has existed.