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2020-10-02 20:03 dustin  
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again inspired by  Arno  :D

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2020-10-02 22:58 Arno  
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i've found out that spinning fflies can be moved left, right or up in this way.  
spinning bflies only left and up.  
vortices of both types only up.  
:-)

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2020-10-04 19:18 dustin  
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ah, isee. moving fflies left makes use of the cso left-right-asymmetry and can therefore not be mirrored. interesting!