Example with a composition

diff --git a/examples/06-composition/06-composition.scm b/examples/06-composition/06-composition.scm
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+#!/usr/bin/env guile
+!#
+
+;;; Gacela, a GNU Guile extension for fast games development
+;;; Copyright (C) 2017 by Javier Sancho Fernandez <jsf at jsancho dot org>
+;;;
+;;; This program is free software: you can redistribute it and/or modify
+;;; it under the terms of the GNU General Public License as published by
+;;; the Free Software Foundation, either version 3 of the License, or
+;;; (at your option) any later version.
+;;;
+;;; This program is distributed in the hope that it will be useful,
+;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;;; GNU General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU General Public License
+;;; along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+(use-modules (gacela))
+
+(define (tick) (* 3000000 (get-internal-real-time)))
+(define (waggle) (* 200 (cos (* pi (tick)))))
+(define (wiggle) (* 300 (sin (* pi (tick)))))
+
+(define left-right-homer
+  (move (image "homer.png")
+        wiggle 0))
+
+(define up-down-marge
+  (move (image "marge.png")
+        0 waggle))
+
+(display-scene
+ (window ((resolution '(640 480)))
+   (over left-right-homer
+         up-down-marge)))

diff --git a/examples/06-composition/homer.png b/examples/06-composition/homer.png
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diff --git a/examples/06-composition/marge.png b/examples/06-composition/marge.png
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