| 摘要 |
A water filled crystal ball with undulating pivot arms is disclosed. The important parts comprise a central rotating shaft, a bushing, undulating pivot arms, and a rotating disk. It is the rotating motion of the central rotating shaft that is the driving force. It is the outer bushing which is the levering force that causes an up and down undulation of the pivot arms inside the glass sphere of the crystal ball. Decorative objects above the fixed disk are moved by a track which is fixed to the top of a rotating disk and move in a level radial back and forth fashion. This produces a scene in which there are multiple directions of motion of decorative objects within a glass sphere.
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