public void deleteWall(ThreeD wall) {
        switch (wall) {
            case Zpos:
                exterior[0] = new Spire(0, 0, 0, 0, 0, 0);
                break;
            case Zneg:
                exterior[1] = new Spire(0, 0, 0, 0, 0, 0);
                ;
                break;
            case Xpos:
                exterior[2] = new Spire(0, 0, 0, 0, 0, 0);
                ;
                break;
            case Xneg:
                exterior[3] = new Spire(0, 0, 0, 0, 0, 0);
                ;
                break;
            case Ypos:
                exterior[4] = new Spire(0, 0, 0, 0, 0, 0);
                ;
                break;
            case Yneg:
                exterior[5] = new Spire(0, 0, 0, 0, 0, 0);
                ;
                break;
        }
    }