This is simple tuto to make a nice heart shape but not only.

from Lindenmayer: "Predefined surfaces (ndlr: and curves) do not “grow.” In order to simulate plant development fully, it is necessary to provide a mechanism for changing the shape as well as the size of surfaces in time".

this time, for the "mechanism", no loop is used.  just create 2 lists (1 arithmetic suite of angle and another of length. then I use those lists to move the axis system (Cf turtle of L-system) in all positions at once. then I use those locations to make the Cordate curve (spline) that will be used for the heart surface.

when you play with the n, "number of points on the spline outline curve", you also play with the growth of the shape.

also, could be useful around 14th of Feb.

I intend to do a few post based on the Cordate curve