         " .  .  . " +
         " .  .  . " +
         "  .. ..  " +
-        "         ")
-    
-    public static let letterYMatrix = NuimoLEDMatrix(string:
+        "         ")}
+    
+    public static var letterYMatrix: NuimoLEDMatrix {return NuimoLEDMatrix(string:
         "         " +
         "  .   .  " +
         "  .   .  " +

        "  .   .  " +
        " ..  ..  " +
        "... ...  " +
        " .   .   ")
    
    public static let lightBulbMatrix = NuimoLEDMatrix(string:
        "         " +
        "   ...   " +
        "  .   .  " +
        "  .   .  " +
        "  .   .  " +
        "   ...   " +
        "   ...   " +
        "   ...   " +
        "    .    ")
    
    public static let powerOnMatrix = NuimoLEDMatrix(string:
        "         " +
        "         " +
        "   ...   " +
        "  .....  " +
        "  .....  " +
        "  .....  " +
        "   ...   " +
        "         " +
        "         ")
    
    public static let powerOffMatrix = NuimoLEDMatrix(string:
        "         " +
        "         " +
        "   ...   " +
        "  .   .  " +
        "  .   .  " +
        "  .   .  " +
        "   ...   " +
        "         " +
        "         ")
    
    public static let shuffleMatrix = NuimoLEDMatrix(string:
        "         " +
        "         " +
        " ..   .. " +

        "   .. .  " +
        "   .  .  " +
        "         " +
        "         ")}
    
    public static var previousMatrix: NuimoLEDMatrix {return NuimoLEDMatrix(string:
        "         " +
        "         " +
        "  .  .   " +
