--- /usr/lib/plt/collects/graphics/turtle-unit.ss	2008-11-16 14:34:52.000000000 -0500
+++ turtle-unit.ss	2009-05-02 11:04:58.000000000 -0400
@@ -227,6 +227,13 @@
     (set! lines-in-drawing null)
     (clear-window)))
 
+(define home
+  (lambda ()
+    (flip-icons)
+    (set! turtles-cache empty-cache)
+    (set! turtles-state (list clear-turtle))
+    (flip-icons)))
+
 ;; cache elements:
 (define-struct c-forward (distance))
 (define-struct c-turn (angle))
--- /usr/lib/plt/collects/graphics/turtle-sig.ss	2008-11-16 14:34:52.000000000 -0500
+++ turtle-sig.ss	2009-05-02 10:52:23.000000000 -0400
@@ -1,7 +1,7 @@
 #lang scheme/signature
 
 turtles
-clear
+clear home
 turn turn/radians
 move move-offset
 draw draw-offset