public void turnLeft() {
			assertMe();
			if(x == 0 && y == 1) { x = 1; y = 0;}
			else if(x == 1 && y == 0) { x = 0; y = -1;}
			else if(x == 0 && y == -1) { x = -1; y = 0;}
			else if(x == -1 && y == 0) { x = 0; y = 1;}
			assertMe();
		}