diff --git a/tools/viz.sh b/tools/viz.sh
new file mode 100755
index 0000000..d73390e
--- /dev/null
+++ b/tools/viz.sh
@@ -0,0 +1,66 @@
+#!/usr/bin/env bash
+
+merge_diff() {
+    SA=`stat -c %s A-${ID}.data 2> /dev/null`
+    SB=`stat -c %s B-${ID}.data 2> /dev/null`
+    SX=`stat -c %s X-${ID}.data 2> /dev/null`
+    if [ \( -n "$SA" \) -a \( -n "$SB" \)  -a \( -n "$SX" \) ]; then
+      export RES="$(expr ${SX:-0} / \( $SA + $SB \))"
+    else
+      export RES=0
+    fi
+    if [[ $RES -eq 0 ]]; then
+      export RES="»"
+    fi
+}
+
+function dynamic() {
+    local old s t start now
+    t=0
+    start=`date +%s`
+    while true ; do
+        s=""
+        for ((i=10; i<22; i++)) ; do
+            if [ -f "C-$i.data" ] ; then
+                s="${s}≡"
+            else
+                s="$s "
+            fi
+            if [ -f "B-$i.data" ] ; then
+                s="${s}="
+            else
+                s="$s "
+            fi
+            if [ -f "A-$i.data" ] ; then
+                s="${s}-"
+            else
+                s="$s "
+            fi
+            if [ -f "X-$i.data" ] ; then
+                export ID="$i"
+                merge_diff
+                s="${s}$RES"
+            elif [ -f "M-$i.data" ] ; then
+                s="${s}M"
+            else
+                s="$s "
+            fi
+            s="$s|"
+        done
+
+        if [[ "$s" != "$old" ]] ; then
+            let "t=t+1"
+            now=`date +%s`
+            let "now=now-start"
+            free=`df -m . 2> /dev/null | tail -1 | awk '{print $4}'`
+            used=`du -m 2> /dev/null | awk '{print $1}' `
+            printf "%5d %6d [%s\n" "$t" "$now" "$s ${used}MB (${free}MB free)"
+            old="$s"
+        else
+            # Sleep a little bit:
+            sleep 1
+        fi
+    done
+}
+
+dynamic