A Japanese novelty made by the Toybox Corporation in 1992, and later copied in Taiwan. A glass with a cocktail drink in it has a special yellow plastic cocktail stirrer placed in it and the glass is put on the black plastic base. Switch on and the cocktail stick immediately starts stirring the drink as if moved by an invisible hand.
All done by magnets of course. Batteries in the base drive a motor which turns a magnet in a circle under the glass. The yellow cocktail stirrer also has a magnet hidden in the end.
The Taiwanese version was designed so that the two magnets repelled each other. This made for a much more chaotic motion than the Japanese original!
The magnetic stirrer found in a chemical laboratory is of course the basis for this idea.
ITEMS IN THE TOY COLLECTION ARE NOT FOR SALE