| 摘要 |
The basic play value of predictability of rebound of a thrown or bounced object is combined with an element of unpredictability in the rebound to provide a plaything from which complex play sequences can be built. The plaything comprises a ring with an axis of symmetry about which a preferential spin can be defined. The surface of the ring includes at least one annular edge characterized by relatively small radius of curvature compared to the ring so that impact of the ring against a flat surface can, in appropriate circumstances, result in an unpredictable rebound when the annular is at or near the point of impact. Complex play sequences can then be developed by attempting to catch the rebounding ring in flight on the first rebound. Play sequences are developed which can accomodate one or an arbitrary number of players.
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