| 摘要 |
Provided is a mobile that includes: (a) a primary attachment point; (b) a set of at least two concentric rings including a main ring having a rotary axis with first and second ends, and at least one additional ring having its own rotary axis and carried by the main ring at the ends of the own rotary axis, each of the rings rotatable about its rotary axis; and (c) a main support element attached to the primary attachment point, configured to engage first and second ends of the rotary axis of the main ring, and being subject to rotational displacement so that the first end is sometimes above and sometimes below the second end.
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