
A cup consists of an inner body, an outer body and a rotatable base located between a hollow space formed between the inner body and the outer body. The rotatable base has a decorative paper and a plurality of magnets facing coils contained in an annular groove opening to the bottom of the outer body. A battery unit, a control circuit and the coils are contained in the annular groove. When the coils are energized by electricity of the battery unit, then the rotatable base together with the decor...











