Man, I love this stuff- I have moved a few equations around and came up with
a pretty fair redwood tree trunk.  You can see a little container clipping on
the front, but I will get rid of that.  Here is the image, and it is not far
removed from the turbulent stone images except by a couple of math terms.

Cheers!

Chip Shults
My robotics, space and CGI web page - http://home.cfl.rr.com/aichip

#macro B(a,b)sphere{<a,b,13>.5pigment{agate}finish{phong.3}}#end#macro N(c,k,a)
#if(k<7)#if(mod(c,2))B(k,a)B(-k,-a)#end N(int(c/2)k+1a)#end#end light_source{0
rgb 1}N(61,1,1)N(37,1,0)N(55,1,-1)N(4,1,-2)N(4,1,-3)N(1,1,3)

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