diff --git a/whalesong/image/private/image.rkt b/whalesong/image/private/image.rkt
index 490e551..f5d9231 100644
--- a/whalesong/image/private/image.rkt
+++ b/whalesong/image/private/image.rkt
@@ -1,13 +1,15 @@
 #lang s-exp "../../lang/base.rkt"
 
 ;; Image functions that be implemented using racket based on primitives
+;; NOTE: Modifications here may require rebuilding of Whalesong
 
 (require "main.rkt"
          "../../lang/for.rkt"
          "../../lang/posn.rkt")
 
 (provide place-images
-         place-images/align)
+         place-images/align
+         empty-image)
 
 ; place-images : (listof image?) (listof posn?) image? -> image?
 (define (place-images images posns scene)
@@ -20,3 +22,5 @@
   (for/fold ([acc scene])
             ([img images] [posn posns])
             (place-image/align img (posn-x posn) (posn-y posn) x-place y-place acc)))
+
+(define empty-image (rectangle 0 0 "solid" "black"))