diff --git a/apps/pixelmechanic/rebound.rb b/apps/pixelmechanic/rebound.rb
new file mode 100755
index 0000000..da5e2bf
--- /dev/null
+++ b/apps/pixelmechanic/rebound.rb
@@ -0,0 +1,50 @@
+#!/usr/bin/env jruby -wKU
+
+#monomer version of pixelmechanic's boiingg: http://docs.monome.org/doku.php?id=app:boiingg
+
+require File.dirname(__FILE__) + '/../../lib/monomer'
+
+class Rebound < Monomer::Listener
+  
+  before_start do
+    @midi = Monomer::MidiOut.new
+    @position  = [0] * monome.row_size
+    @direction = [0] * monome.row_size
+    @range     = [0] * monome.row_size
+  end
+  
+  on_start do
+    timely_repeat(0.14) do
+      update_patterns
+      send_midi_and_light_monome
+    end
+  end
+  
+  on_key_down do |x,y|
+    @range[x]    = y
+    @direction[x]= -1 
+    @position[x] = y
+  end
+  
+  def self.update_patterns
+    @range.each_with_index do |range, index|
+      if range != 0
+        @position[index] += @direction[index]
+        @direction[index] *= -1 if @position[index] == 0 || @position[index] == range
+      end
+    end
+  end
+  
+  def self.send_midi_and_light_monome
+    @position.each_with_index do |position, index|
+      monome.clear_column(index)
+      if @range[index] != 0
+        monome.led_on(index, position) 
+        @midi.on(40 + index) if position == 0
+      end
+    end
+  end
+  
+end
+
+Monomer::Monome.create.with_listeners(Rebound).start  if $0 == __FILE__
\ No newline at end of file
diff --git a/lib/monomer/monome.rb b/lib/monomer/monome.rb
index da66167..f371240 100644
--- a/lib/monomer/monome.rb
+++ b/lib/monomer/monome.rb
@@ -87,7 +87,8 @@ def toggle_led(x,y)
     end
     
     def clear_column(col)
-      light_column(col, 0,0,0,0,0,0,0,0)
+      col__light_pattern = (0..max_y).map{|y|led_off(col,y)}.map{|need_to_turn_off| need_to_turn_off ? 0 : 1}
+      light_column(col, *col__light_pattern)
     end
     
     def light_column(col, *pattern)