+.B \-iterate
+Calculate by iteratively applying the functions in a random order,
+usually faster than \fI\-recurse\fP. This is the default.
+.TP 8
+.B \-recurse
+Calculate by recursively applying all combinations of the functions.
+This is the historical behavior and may produce neater output than
+\fI\-iterate\fP.
+.TP 8
+.B \-no-rotate
+Disable the rotation component of the functions.
+.TP 8
+.B \-no-scale
+Disable the scaling component of the functions.
+.TP 8
+.B \-no-translate
+Disable the varying translation component of the functions.
+.TP 8
+.B \-no-multi
+Turn off multi-coloured mode, only one colour is used to colour the whole set.
+.TP 8
+.B \-fps
+Display the current frame rate and CPU load.