This article is from the Fractal FAQ, by Ermel Stepp stepp@muvms6.mu.wvnet.edu with numerous contributions by others.
They are a Fractint fractal and are similar to fractal mountains.
Instead of a 2-d table of heights, the result is a 2-d table of intensities.
They are formed by repeatedly subdividing squares.
Network resources:
http://climate.gsfc.nasa.gov/~cahalan/FractalClouds/FractalClouds.html
Fractal Clouds Reference (calahan@clouds.gsfc.nasa.gov)
http://ivory.nosc.mil/html/trancv/html/cloud-fract.html
Fractal generated clouds (cahalan@clouds.gsfc.nasa.gov)
 
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