And thus we have made you a just community that you will be witnesses over the people and the Messenger will be a witness over you. And We did not make the qiblah which you used to face except that We might make evident who would follow the Messenger from who would turn back on his heels. And indeed, it is difficult except for those whom Allah has guided. And never would Allah have caused you to lose your faith. Indeed Allah is, to the people, Kind and Merciful. (2:143)
The direction of prayer is a coincidence between the corporeal body of the supplicant, the geology of the earth and the conduit to the Divine. To put our “face” in this direction is to align our crystalized surface of perception (our little face) in potential mirroring of the Greater Face of the Divine, according to a function of this bio/geo/spiritual synchronization. A face-to-Face conversation, so to speak.