I skipped chapter 3 of "the algorithmic beauty of plants", but will come back later.

I started Chapter 4, about phyllotaxis

https://en.wikipedia.org/wiki/Phyllotaxis#:~:text=In%20botany%2C%20phyllotaxis%20or%20phyllotaxy,class%20of%20patterns%20in%20nature.

the first model is the sunflower, which I struggled with, a few years ago... the book presents the Vogel's L-system formula for sunflower distribution of central seeds.

A (n) -> +(a) [f(sqrt(n))~D]A(n+1) (below)

but this can be easily put into equation with n only...

then no need for loop!!! and with the turtle (axis system yell/pitch/roll), the modeling became simple. so I could make a Tutorial out of it.

what is puzzling, even by any logical explanation, is the sensitivity of the angle parameter

137.5deg is perfect... +1 deg or -1 deg shows nice Fermat's spirals but so different visually...

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