"What is born of Spirit is Spirit, and what is born of flesh is flesh."
Spirit and Flesh are indeed made of different material, but,one will need a spirital eye to see into the spiritual relm. So yes, you can see spiritual things but with a spiritual or ealge's eye. The differences between the two relms are stories told only by those who can see in both relms. Hopefully our veils will be raised soon so we can know what is beyond our natural sights. And "we having eyes may see" but see spiritually.
Face, front, and back are just words used for our natural minds to form a vivid picture of the event for a greater apprecitation. But i suppose physical references used in the natural will be applicable in the spiritual relm for descriptive purposes. Sirit looks like the flesh but yet different, yuh know.
Moses wanted to see God's glory, but God said he will not be able to see his face, which maybe is the fullness of his glory. It is like I am replying to Amanda but I can't really get a clue as to who Amanda is until i see her face which contains the window to her soul. It is hard to explain but as hummans we need to satisfy our curiosity, eg you are not satisifed by just talking to a voice on the phone, you will eventually want to meet that person face to face. Moses altough asking for the glory really want to see the Face of the being he held in such high esteem and whom he worshipped. The Face is a representation of Gods' full glory. However, this is not possible for natural man, so God satified his thirst with the sight of his back while protecting him with his hand.
Who can undertand the greatness of GOD?