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

        "  .   .  " +
        "  .   .  " +
        "   ...   " +
        "         ")
    
    public static let letterWMatrix = NuimoLEDMatrix(string:
        "         " +
        " .     . " +
        " .     . " +

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