(unit/sig value-turtles^
  
  (import mzlib:function^
	  mzlib:math^
	  mred^)

  (define-values/invoke-unit/sig value-turtles^
    (require-library "value-turtle-lib.ss" "graphics")
    #f
    mzlib:function^
    mzlib:math^
    mred^))
