diff --git a/config.lua b/config.lua
index e7d9000..ebad9c3 100644
--- a/config.lua
+++ b/config.lua
@@ -3,3 +3,9 @@ Config = {
     gridOffset = 0,
     portWidth = 16
 }
+
+Color = {
+    input = { 0.8, 0.3, 0.3, 1 },
+    output = { 0.3, 0.3, 0.8, 1 },
+    mechanism = { 0.8, 0.8, 0.8, 1 }
+}
diff --git a/selector.lua b/selector.lua
index e55713c..bc77724 100644
--- a/selector.lua
+++ b/selector.lua
@@ -11,7 +11,18 @@ local mecha2 = Mechanism:new( GridPoint:new(10, 5), GridPoint:new(2, 2), { port1
 
 local mecha3 = Mechanism:new( GridPoint:new(13, 5), GridPoint:new(2, 1), { port1:clone(), port2:clone(), port5:clone() }, {1, 0.5, 0.5, 1} )
 
-local mechs = { mecha1, mecha2, mecha3 }
+local conveyorPortI1 = Port:new( GridPoint:new(-1, 0), PortRotation.left, Color.input )
+local conveyorPortI2 = Port:new( GridPoint:new(0, -1), PortRotation.up, Color.input )
+local conveyorPortI3 = Port:new( GridPoint:new(0, 1), PortRotation.down, Color.input )
+local conveyorPortO = Port:new( GridPoint:new(1, 0), PortRotation.right, Color.output )
+local conveyorMecha = Mechanism:new( GridPoint:new(0, 0), GridPoint:new(1, 1), {
+    conveyorPortI1:clone(),
+    conveyorPortI2:clone(),
+    conveyorPortI3:clone(),
+    conveyorPortO:clone()
+}, Color.mechanism )
+
+local mechs = { conveyorMecha, mecha2, mecha3 }
 local actions = { 'none', 'first', 'second', 'third' }
 
 local selected = 0