You begin staring out the tiny windows on top of a wood-paneled wall. Look behind you towards your left and you should see an exit from this semi-circular room Continue through this exit, there are doors on the right, but you want to go straight out of the open hall. Once you are out, make an immediate left. Follow along the curved shelving unit, towards the bright part of the hall. Once you're there, you should see a barred gate. Phase through the gate, and then continue forwards along the small curved brick hallway. Once you're out where the tiny hallway opens up and you can see a pool and some cactus-es. Turn immediately left, and move towards the left most shuttered circular window in the brick wall. Turn slightly left again and move towards the left most shuttered circular window in the brick wall. Once you are up against it, between the circular shuttered window, and the small triangular window, you're done.