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Mushroom Billiard
Cap Radius:
160
Stem Width:
0.40
Stem Height:
200
Ball Speed:
3
Trail Length:
1500
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Regular (stays in cap)
Chaotic (enters stem)
The mushroom billiard is the simplest known system with a sharply divided phase space. Orbits staying in the semicircular cap are regular; those entering the stem become chaotic.