{{:en:kahn_joel_fractal_forces.png?200|}}
Fractal Forces by Joel Kahn  (June 2010)
<code>
# Contributed by Joel Kahn
cls
clg
graphsize 700,500
dim f(8)
f[0]=0
f[1]=0
f[2]=50
f[3]=0
f[4]=50
f[5]=1
f[6]=0
f[7]=1
q=1.0
qq=0.9997
v=0.01
vv=0.0004
xs=750
xm=650
ys=730
ym=180
c=0
br=-.7393
bi=.117
ar=0
ai=0
for d=1 to 150000
   tr=ar*ar-ai*ai+br
   ti=2*ar*ai+bi
   x=tr*xs+xm
   y=ti*ys+ym
   v=v+vv
   q=q*qq
   c=d^2.1
   color c
   stamp x,y,q,v,f
   ar=tr
   ai=ti
next d
</code>