Wow, the walls look really great, but the sphere swept edges are sort of
odd.  Maybe if you cut the radius way down on the inner one and removed it
altogether on the outside edges, it would look better.  I can imagine some
mortar inside that inner joint, but the outer edges of stone walls were not
dressed that way.  It looks like caulking squirted on the edges.
    The incising is great and the overall feel is too.  This looks like it would
be a fun macro to play with.

Cheers!

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

light_source{0#macro k(_)sphere{13*z+i*_.5pigment{agate}finish{phong.3}}#end
1}#macro _(s,i,g)#if(s)k(1)k(-1)_(s-1i+g,g)#end#end _(3x+3*y<2,-2>)_(2x,y)_(
2x-y,x)_(4x*3,-y)_(4<3,1>x)_(2x*6,-y)

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