Spirofern

startshape scene
 
rule scene {
    8*{r 45}wiggle{}
}
 
rule wiggle {
    twist{}
    wiggle{s 0.9 r 6 y 1}
}
 
rule twist {
    twirl{}
    twist {s 0.9 r 1 x -1}
}
 
rule twirl {
    TRIANGLE{a -0.9}
    twirl {s 0.9 r 3 x 1}
}