These clever little devices are called pyramids in German, but are probably better described as carousels. They operate on a very simple premise. The heat generated from the candles moves the wooden fan blades above, causing everything to spin. Usually there are little figures in the pyramids center that enjoy going for a ride. As you can see from the video below, pyramids can range from table top size up to mammoth heights taller than a building.

Er, it seems I failed to video tape one that actually is spinning from the heat of candles. Ah well, maybe next year. Believe me when I say they can really book! I’m honestly not sure what connection they have to Christmas, but “Weihnachtspyramide” make fantastic decorations.