I think I'm missing your point here Kai.
We can find figure such as fiddle back and curly grain of various types in many different trees from the artic circle to the tropics.
One of the major types of curly figure is what we call compression grain, this is where you get figure as the result of constant prevailing winds, or it can occur adjacent to a large branch, where it will often finish up as feather crotch or one of the other crotch variants.
Genetics can also play a role in providing fancy figure, and there also seems to be a strng argument for mineral uptake from the soil having an influence.
What I am saying here is all opinion that I have picked up from being around cabinet makers, stock makers, and musical instrument makers for most of my life. It is if you like, "trade belief".
To the best of my knowledge the academics who study this type of thing have not yet come up with any definite reasons for the formation of fancy figure in wood, about all they seem to be able to say is that there are many reasons for this occurrence of fancy grain, and those reasons are not yet fully understood..
Can you expand on your statement, especially the effect that a monsoonal climate can have in creating a curly grain?
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