Client:

    180*|-y
	|
	|
+x	|	-x
--------|--------
90*	|	270*
	|
	|
	|
    360*|+y


Server:

	 *                 pi/2
	 *
	 *                  ^
	 *               +Y |
	 *             II   |   I
	 *          -X      |      +X
	 *    pi   <--------0-------->   0
	 *    	  	    |
	 *            III   |   IV
	 *               -Y |
	 *                  V
	 *
	 *                -pi/2