diff --git a/tools/motionblur.sh b/tools/motionblur.sh
new file mode 100755
index 0000000..ab47916
--- /dev/null
+++ b/tools/motionblur.sh
@@ -0,0 +1,36 @@
+#!/bin/bash
+
+#
+#	a new experiment 2026/02/29
+#
+
+	##############################
+	#   THIS SOFTWARE IS A MESS  #
+	#    TOO SLOW FOR REAL USE   #
+	##############################
+
+set -e   ;   set -u
+source tools/config.sh
+
+NB_SRC=$(ls -1 frames/Spool | wc -l)
+
+printf "%s: %d frames\n" $0 $NB_SRC | tee -a WS/log
+
+# -------------------------------------------------------
+#		MAIN LOOP
+
+for frame in $(seq 1 $(( $NB_SRC-1 )) )
+do
+	imgA=$(printf "frames/Spool/%05d.png" $frame)
+	imgB=$(printf "frames/Spool/%05d.png" $((frame-1)))
+	imgC=$(printf "frames/TMP/%05d.png" $frame)
+	# echo $imgA $imgB
+	printf "%d " $frame 
+	composite	$imgA   $imgB			\
+			-blend  70%			\
+			$imgC
+done
+
+ff_encodage TMP motion-blurred.mp4
+
+# -------------------------------------------------------