to spiral : size if : size ) 30 ( stop ) ; a condition stop fd : size rt 15 ; many lines of action spiral : size \* 1.02 ; the tailend recursive call end Type this in the command box . to spiral : size if : size ) 30 ( stop ) ; an exit condition fd : size rt 15 ; many lines of action spiral : size \* 1.02 ; the tailend recursive call end