private String colorToCharacter(SquareColor color) {
        if (color == null) {
            return " ";
        }
        switch (color) {
            case CYAN:
                return ("◘");
            case RED:
                return ("◙");
            case BLUE:
                return ("█");
            case GREEN:
                return ("▓");
            case YELLOW:
                return ("■");
            case PURPLE:
                return ("▒");
            case ORANGE:
                return ("░");
            default:
                return ("?");
        }
    }