By the way, when calculating handedness-related things literally
using your hand as an aid, it's very important to remember that
the thum is *always* the x-axis (and the next fingers are the y and
the z axes).
  I once saw a site which explained the handedness in the wrong way.
IIRC it had the middle finger as x and the thumb as z. This completely
reverses the whole concept. If you do it this way, all rotations will
be reversed (you can't use your hand to visualize the direction of the
rotation in a given coordinate system because it will be reversed).

  (If you didn't know, you can easily visualize which direction does
a positive angle rotate an object by pointing your thumb (of the left
hand if you are using the left-handed coordinates) towards the positive
axis around which you are rotating and bend your fingers.)

-- 
#macro M(A,N,D,L)plane{-z,-9pigment{mandel L*9translate N color_map{[0rgb x]
[1rgb 9]}scale<D,D*3D>*1e3}rotate y*A*8}#end M(-3<1.206434.28623>70,7)M(
-1<.7438.1795>1,20)M(1<.77595.13699>30,20)M(3<.75923.07145>80,99)// - Warp -

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