public void AddSymbol(Sprite symbol, int index)
 {
     symbolHolder.AddSymbol(symbol, index, false);
 }
 public void AddSymbol(MovementDirectionUtilities.MovementDirection movementDirection, int index)
 {
     mainSymbolHolder.AddSymbol(arrows[movementDirection], index,
                                movementDirection == MovementDirectionUtilities.MovementDirection.None);
 }