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The ratio 3:1 is not surprising me, and no simple ratio would surprise me.
Note that from 3:1 you have also 1:3 and thus why not 1-1:3=2:3, then 3:2, or 1:(1+3)=1:4, etc.
I am quite sure that most physical phenomena exhibits simple ratios.
Since the physicists have modeled many physical phenomena, then most simple ratios should be many times encountered. Cenverting them so that the 3:1 appears is just an exercise which should be frequently successful.
Would a ratio of two big integers (without common divisors) surprise you ?
Probably they would be more surprising than simple ratios, and in this case, all ratios would be surprising, discarding their value.
To summarize, I cannot deduce anything informative from the ratio 3:1
Regarding the difference between static and dynamic symmetry and the diffrence between discrete and continuous symmetry, I would say that they are rather artificial.
An unifying definition of symmetry, such as the one I publihed in 2007 (pdf downloadable from http://petitjeanmichel.free.f/itoweb.petitjean.symmetry.html) should cover all these situations, so that the concept of metasymmetry does not appear to me as being necessary.
Of course, I would be delighted if you can exhibit a symmetry situation for which you prove that it cannot be covered from the general definition. But in this case, you must also state why it is anyway a symmetry situation, thus refering to an other definition of symmetry (please cite it rigorously, not intuitively).
All my best,
Michel Petitjean.