    The number of steps used by turbulence is controlled by the 'octaves'
 value.  The values may range from 1 up to 10.  The default value of 'octaves
 6' is fairly close to the upper limit; you won't see much change by setting
 it to a higher value because the extra steps are too small.  You can achieve
 some very interesting wavy effects by specifying lower values.  Setting oc-
 taves higher can slow down rendering because more steps are computed.

