Neat animation! Why did you make the "seeds" get bigger with radius?

By the way, my calculator says the angle is 137.507764...

It's not my work, I picked it up from Bjorn Samuelsson's webpages a couple of years ago when I was learning postscript and collecting graphics. http://home.thep.lu.se/~bjorn/ http://home.thep.lu.se/~bjorn/postscript having "seeds' bigger with radius allowed me to do a zoom at the start of the animation with real sunflowers evidently one needs to understand the dynamics of plant buds; 'primordia' which has been the subject of much recent research also some Maple code for sunflowers; http://homepages.math.uic.edu/~howard/version5/spirals6v5.html Stuart