The present invention is such that a doll equipped with a plurality of auxiliary magnetic poles is inserted into a hermetically-sealed container filled with liquid and the container is circumferentially arranged with variable magnetic poles whose polarities are determined by electromagnets, whereby attraction or repulsion is applied on each portion of the doll. The polarity of each variable magnetic pole can be arbitrarily controlled by adjustment of direction of current flowing in the electromagnets to enable the doll in the container to be driven in various types of motions. Therefore, the motions of the doll can be expressed in various interesting types including dancing to the accompaniment of music without recourse to making the doll in a complicated robotic shape.